embed xexpr-path

1 files changed, 0 insertions, 4676 deletions

diff --git a/datastore-leveldb/wwwroot_ebus/lib/d3-v2.6.1/d3.js b/datastore-leveldb/wwwroot_ebus/lib/d3-v2.6.1/d3.js
deleted file mode 100644
index d71f57d..0000000
--- a/datastore-leveldb/wwwroot_ebus/lib/d3-v2.6.1/d3.js
+++ /dev/null
@@ -1,4676 +0,0 @@
-(function(){if (!Date.now) Date.now = function() {
-  return +new Date;
-};
-try {
-  document.createElement("div").style.setProperty("opacity", 0, "");
-} catch (error) {
-  var d3_style_prototype = CSSStyleDeclaration.prototype,
-      d3_style_setProperty = d3_style_prototype.setProperty;
-  d3_style_prototype.setProperty = function(name, value, priority) {
-    d3_style_setProperty.call(this, name, value + "", priority);
-  };
-}
-d3 = {version: "2.6.1"}; // semver
-var d3_array = d3_arraySlice; // conversion for NodeLists
-
-function d3_arrayCopy(pseudoarray) {
-  var i = -1, n = pseudoarray.length, array = [];
-  while (++i < n) array.push(pseudoarray[i]);
-  return array;
-}
-
-function d3_arraySlice(pseudoarray) {
-  return Array.prototype.slice.call(pseudoarray);
-}
-
-try {
-  d3_array(document.documentElement.childNodes)[0].nodeType;
-} catch(e) {
-  d3_array = d3_arrayCopy;
-}
-
-var d3_arraySubclass = [].__proto__?
-
-// Until ECMAScript supports array subclassing, prototype injection works well.
-function(array, prototype) {
-  array.__proto__ = prototype;
-}:
-
-// And if your browser doesn't support __proto__, we'll use direct extension.
-function(array, prototype) {
-  for (var property in prototype) array[property] = prototype[property];
-};
-function d3_this() {
-  return this;
-}
-d3.functor = function(v) {
-  return typeof v === "function" ? v : function() { return v; };
-};
-// Copies a variable number of methods from source to target.
-d3.rebind = function(target, source) {
-  var i = 1, n = arguments.length, method;
-  while (++i < n) target[method = arguments[i]] = d3_rebind(target, source, source[method]);
-  return target;
-};
-
-// Method is assumed to be a standard D3 getter-setter:
-// If passed with no arguments, gets the value.
-// If passed with arguments, sets the value and returns the target.
-function d3_rebind(target, source, method) {
-  return function() {
-    var value = method.apply(source, arguments);
-    return arguments.length ? target : value;
-  };
-}
-d3.ascending = function(a, b) {
-  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
-};
-d3.descending = function(a, b) {
-  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
-};
-d3.mean = function(array, f) {
-  var n = array.length,
-      a,
-      m = 0,
-      i = -1,
-      j = 0;
-  if (arguments.length === 1) {
-    while (++i < n) if (d3_number(a = array[i])) m += (a - m) / ++j;
-  } else {
-    while (++i < n) if (d3_number(a = f.call(array, array[i], i))) m += (a - m) / ++j;
-  }
-  return j ? m : undefined;
-};
-d3.median = function(array, f) {
-  if (arguments.length > 1) array = array.map(f);
-  array = array.filter(d3_number);
-  return array.length ? d3.quantile(array.sort(d3.ascending), .5) : undefined;
-};
-d3.min = function(array, f) {
-  var i = -1,
-      n = array.length,
-      a,
-      b;
-  if (arguments.length === 1) {
-    while (++i < n && ((a = array[i]) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = array[i]) != null && a > b) a = b;
-  } else {
-    while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = f.call(array, array[i], i)) != null && a > b) a = b;
-  }
-  return a;
-};
-d3.max = function(array, f) {
-  var i = -1,
-      n = array.length,
-      a,
-      b;
-  if (arguments.length === 1) {
-    while (++i < n && ((a = array[i]) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = array[i]) != null && b > a) a = b;
-  } else {
-    while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = f.call(array, array[i], i)) != null && b > a) a = b;
-  }
-  return a;
-};
-d3.extent = function(array, f) {
-  var i = -1,
-      n = array.length,
-      a,
-      b,
-      c;
-  if (arguments.length === 1) {
-    while (++i < n && ((a = c = array[i]) == null || a != a)) a = c = undefined;
-    while (++i < n) if ((b = array[i]) != null) {
-      if (a > b) a = b;
-      if (c < b) c = b;
-    }
-  } else {
-    while (++i < n && ((a = c = f.call(array, array[i], i)) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = f.call(array, array[i], i)) != null) {
-      if (a > b) a = b;
-      if (c < b) c = b;
-    }
-  }
-  return [a, c];
-};
-d3.random = {
-  normal: function(mean, deviation) {
-    if (arguments.length < 2) deviation = 1;
-    if (arguments.length < 1) mean = 0;
-    return function() {
-      var x, y, r;
-      do {
-        x = Math.random() * 2 - 1;
-        y = Math.random() * 2 - 1;
-        r = x * x + y * y;
-      } while (!r || r > 1);
-      return mean + deviation * x * Math.sqrt(-2 * Math.log(r) / r);
-    };
-  }
-};
-function d3_number(x) {
-  return x != null && !isNaN(x);
-}
-d3.sum = function(array, f) {
-  var s = 0,
-      n = array.length,
-      a,
-      i = -1;
-
-  if (arguments.length === 1) {
-    while (++i < n) if (!isNaN(a = +array[i])) s += a;
-  } else {
-    while (++i < n) if (!isNaN(a = +f.call(array, array[i], i))) s += a;
-  }
-
-  return s;
-};
-// R-7 per <http://en.wikipedia.org/wiki/Quantile>
-d3.quantile = function(values, p) {
-  var H = (values.length - 1) * p + 1,
-      h = Math.floor(H),
-      v = values[h - 1],
-      e = H - h;
-  return e ? v + e * (values[h] - v) : v;
-};
-d3.transpose = function(matrix) {
-  return d3.zip.apply(d3, matrix);
-};
-d3.zip = function() {
-  if (!(n = arguments.length)) return [];
-  for (var i = -1, m = d3.min(arguments, d3_zipLength), zips = new Array(m); ++i < m;) {
-    for (var j = -1, n, zip = zips[i] = new Array(n); ++j < n;) {
-      zip[j] = arguments[j][i];
-    }
-  }
-  return zips;
-};
-
-function d3_zipLength(d) {
-  return d.length;
-}
-// Locate the insertion point for x in a to maintain sorted order. The
-// arguments lo and hi may be used to specify a subset of the array which should
-// be considered; by default the entire array is used. If x is already present
-// in a, the insertion point will be before (to the left of) any existing
-// entries. The return value is suitable for use as the first argument to
-// `array.splice` assuming that a is already sorted.
-//
-// The returned insertion point i partitions the array a into two halves so that
-// all v < x for v in a[lo:i] for the left side and all v >= x for v in a[i:hi]
-// for the right side.
-d3.bisectLeft = function(a, x, lo, hi) {
-  if (arguments.length < 3) lo = 0;
-  if (arguments.length < 4) hi = a.length;
-  while (lo < hi) {
-    var mid = (lo + hi) >> 1;
-    if (a[mid] < x) lo = mid + 1;
-    else hi = mid;
-  }
-  return lo;
-};
-
-// Similar to bisectLeft, but returns an insertion point which comes after (to
-// the right of) any existing entries of x in a.
-//
-// The returned insertion point i partitions the array into two halves so that
-// all v <= x for v in a[lo:i] for the left side and all v > x for v in a[i:hi]
-// for the right side.
-d3.bisect =
-d3.bisectRight = function(a, x, lo, hi) {
-  if (arguments.length < 3) lo = 0;
-  if (arguments.length < 4) hi = a.length;
-  while (lo < hi) {
-    var mid = (lo + hi) >> 1;
-    if (x < a[mid]) hi = mid;
-    else lo = mid + 1;
-  }
-  return lo;
-};
-d3.first = function(array, f) {
-  var i = 0,
-      n = array.length,
-      a = array[0],
-      b;
-  if (arguments.length === 1) f = d3.ascending;
-  while (++i < n) {
-    if (f.call(array, a, b = array[i]) > 0) {
-      a = b;
-    }
-  }
-  return a;
-};
-d3.last = function(array, f) {
-  var i = 0,
-      n = array.length,
-      a = array[0],
-      b;
-  if (arguments.length === 1) f = d3.ascending;
-  while (++i < n) {
-    if (f.call(array, a, b = array[i]) <= 0) {
-      a = b;
-    }
-  }
-  return a;
-};
-d3.nest = function() {
-  var nest = {},
-      keys = [],
-      sortKeys = [],
-      sortValues,
-      rollup;
-
-  function map(array, depth) {
-    if (depth >= keys.length) return rollup
-        ? rollup.call(nest, array) : (sortValues
-        ? array.sort(sortValues)
-        : array);
-
-    var i = -1,
-        n = array.length,
-        key = keys[depth++],
-        keyValue,
-        object,
-        o = {};
-
-    while (++i < n) {
-      if ((keyValue = key(object = array[i])) in o) {
-        o[keyValue].push(object);
-      } else {
-        o[keyValue] = [object];
-      }
-    }
-
-    for (keyValue in o) {
-      o[keyValue] = map(o[keyValue], depth);
-    }
-
-    return o;
-  }
-
-  function entries(map, depth) {
-    if (depth >= keys.length) return map;
-
-    var a = [],
-        sortKey = sortKeys[depth++],
-        key;
-
-    for (key in map) {
-      a.push({key: key, values: entries(map[key], depth)});
-    }
-
-    if (sortKey) a.sort(function(a, b) {
-      return sortKey(a.key, b.key);
-    });
-
-    return a;
-  }
-
-  nest.map = function(array) {
-    return map(array, 0);
-  };
-
-  nest.entries = function(array) {
-    return entries(map(array, 0), 0);
-  };
-
-  nest.key = function(d) {
-    keys.push(d);
-    return nest;
-  };
-
-  // Specifies the order for the most-recently specified key.
-  // Note: only applies to entries. Map keys are unordered!
-  nest.sortKeys = function(order) {
-    sortKeys[keys.length - 1] = order;
-    return nest;
-  };
-
-  // Specifies the order for leaf values.
-  // Applies to both maps and entries array.
-  nest.sortValues = function(order) {
-    sortValues = order;
-    return nest;
-  };
-
-  nest.rollup = function(f) {
-    rollup = f;
-    return nest;
-  };
-
-  return nest;
-};
-d3.keys = function(map) {
-  var keys = [];
-  for (var key in map) keys.push(key);
-  return keys;
-};
-d3.values = function(map) {
-  var values = [];
-  for (var key in map) values.push(map[key]);
-  return values;
-};
-d3.entries = function(map) {
-  var entries = [];
-  for (var key in map) entries.push({key: key, value: map[key]});
-  return entries;
-};
-d3.permute = function(array, indexes) {
-  var permutes = [],
-      i = -1,
-      n = indexes.length;
-  while (++i < n) permutes[i] = array[indexes[i]];
-  return permutes;
-};
-d3.merge = function(arrays) {
-  return Array.prototype.concat.apply([], arrays);
-};
-d3.split = function(array, f) {
-  var arrays = [],
-      values = [],
-      value,
-      i = -1,
-      n = array.length;
-  if (arguments.length < 2) f = d3_splitter;
-  while (++i < n) {
-    if (f.call(values, value = array[i], i)) {
-      values = [];
-    } else {
-      if (!values.length) arrays.push(values);
-      values.push(value);
-    }
-  }
-  return arrays;
-};
-
-function d3_splitter(d) {
-  return d == null;
-}
-function d3_collapse(s) {
-  return s.replace(/(^\s+)|(\s+$)/g, "").replace(/\s+/g, " ");
-}
-/**
- * @param {number} start
- * @param {number=} stop
- * @param {number=} step
- */
-d3.range = function(start, stop, step) {
-  if (arguments.length < 3) {
-    step = 1;
-    if (arguments.length < 2) {
-      stop = start;
-      start = 0;
-    }
-  }
-  if ((stop - start) / step == Infinity) throw new Error("infinite range");
-  var range = [],
-       i = -1,
-       j;
-  if (step < 0) while ((j = start + step * ++i) > stop) range.push(j);
-  else while ((j = start + step * ++i) < stop) range.push(j);
-  return range;
-};
-d3.requote = function(s) {
-  return s.replace(d3_requote_re, "\\$&");
-};
-
-var d3_requote_re = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;
-d3.round = function(x, n) {
-  return n
-      ? Math.round(x * Math.pow(10, n)) * Math.pow(10, -n)
-      : Math.round(x);
-};
-d3.xhr = function(url, mime, callback) {
-  var req = new XMLHttpRequest;
-  if (arguments.length < 3) callback = mime;
-  else if (mime && req.overrideMimeType) req.overrideMimeType(mime);
-  req.open("GET", url, true);
-  req.onreadystatechange = function() {
-    if (req.readyState === 4) callback(req.status < 300 ? req : null);
-  };
-  req.send(null);
-};
-d3.text = function(url, mime, callback) {
-  function ready(req) {
-    callback(req && req.responseText);
-  }
-  if (arguments.length < 3) {
-    callback = mime;
-    mime = null;
-  }
-  d3.xhr(url, mime, ready);
-};
-d3.json = function(url, callback) {
-  d3.text(url, "application/json", function(text) {
-    callback(text ? JSON.parse(text) : null);
-  });
-};
-d3.html = function(url, callback) {
-  d3.text(url, "text/html", function(text) {
-    if (text != null) { // Treat empty string as valid HTML.
-      var range = document.createRange();
-      range.selectNode(document.body);
-      text = range.createContextualFragment(text);
-    }
-    callback(text);
-  });
-};
-d3.xml = function(url, mime, callback) {
-  function ready(req) {
-    callback(req && req.responseXML);
-  }
-  if (arguments.length < 3) {
-    callback = mime;
-    mime = null;
-  }
-  d3.xhr(url, mime, ready);
-};
-var d3_nsPrefix = {
-  svg: "http://www.w3.org/2000/svg",
-  xhtml: "http://www.w3.org/1999/xhtml",
-  xlink: "http://www.w3.org/1999/xlink",
-  xml: "http://www.w3.org/XML/1998/namespace",
-  xmlns: "http://www.w3.org/2000/xmlns/"
-};
-
-d3.ns = {
-  prefix: d3_nsPrefix,
-  qualify: function(name) {
-    var i = name.indexOf(":");
-    return i < 0 ? (name in d3_nsPrefix
-      ? {space: d3_nsPrefix[name], local: name} : name)
-      : {space: d3_nsPrefix[name.substring(0, i)], local: name.substring(i + 1)};
-  }
-};
-d3.dispatch = function() {
-  var dispatch = new d3_dispatch(),
-      i = -1,
-      n = arguments.length;
-  while (++i < n) dispatch[arguments[i]] = d3_dispatch_event();
-  return dispatch;
-};
-
-function d3_dispatch() {}
-
-d3_dispatch.prototype.on = function(type, listener) {
-  var i = type.indexOf("."),
-      name = "";
-
-  // Extract optional namespace, e.g., "click.foo"
-  if (i > 0) {
-    name = type.substring(i + 1);
-    type = type.substring(0, i);
-  }
-
-  return arguments.length < 2
-      ? this[type].on(name)
-      : (this[type].on(name, listener), this);
-};
-
-function d3_dispatch_event() {
-  var listeners = [],
-      listenerByName = {};
-
-  function dispatch() {
-    var z = listeners, // defensive reference
-        i = -1,
-        n = z.length,
-        l;
-    while (++i < n) if (l = z[i].on) l.apply(this, arguments);
-  }
-
-  dispatch.on = function(name, listener) {
-    var l, i;
-
-    // return the current listener, if any
-    if (arguments.length < 2) return (l = listenerByName[name]) && l.on;
-
-    // remove the old listener, if any (with copy-on-write)
-    if (l = listenerByName[name]) {
-      l.on = null;
-      listeners = listeners.slice(0, i = listeners.indexOf(l)).concat(listeners.slice(i + 1));
-      delete listenerByName[name];
-    }
-
-    // add the new listener, if any
-    if (listener) {
-      listeners.push(listenerByName[name] = {on: listener});
-    }
-
-    return dispatch;
-  };
-
-  return dispatch;
-};
-// TODO align
-d3.format = function(specifier) {
-  var match = d3_format_re.exec(specifier),
-      fill = match[1] || " ",
-      sign = match[3] || "",
-      zfill = match[5],
-      width = +match[6],
-      comma = match[7],
-      precision = match[8],
-      type = match[9],
-      scale = 1,
-      suffix = "",
-      integer = false;
-
-  if (precision) precision = +precision.substring(1);
-
-  if (zfill) {
-    fill = "0"; // TODO align = "=";
-    if (comma) width -= Math.floor((width - 1) / 4);
-  }
-
-  switch (type) {
-    case "n": comma = true; type = "g"; break;
-    case "%": scale = 100; suffix = "%"; type = "f"; break;
-    case "p": scale = 100; suffix = "%"; type = "r"; break;
-    case "d": integer = true; precision = 0; break;
-    case "s": scale = -1; type = "r"; break;
-  }
-
-  // If no precision is specified for r, fallback to general notation.
-  if (type == "r" && !precision) type = "g";
-
-  type = d3_format_types[type] || d3_format_typeDefault;
-
-  return function(value) {
-
-    // Return the empty string for floats formatted as ints.
-    if (integer && (value % 1)) return "";
-
-    // Convert negative to positive, and record the sign prefix.
-    var negative = (value < 0) && (value = -value) ? "\u2212" : sign;
-
-    // Apply the scale, computing it from the value's exponent for si format.
-    if (scale < 0) {
-      var prefix = d3.formatPrefix(value, precision);
-      value *= prefix.scale;
-      suffix = prefix.symbol;
-    } else {
-      value *= scale;
-    }
-
-    // Convert to the desired precision.
-    value = type(value, precision);
-
-    // If the fill character is 0, the sign and group is applied after the fill.
-    if (zfill) {
-      var length = value.length + negative.length;
-      if (length < width) value = new Array(width - length + 1).join(fill) + value;
-      if (comma) value = d3_format_group(value);
-      value = negative + value;
-    }
-
-    // Otherwise (e.g., space-filling), the sign and group is applied before.
-    else {
-      if (comma) value = d3_format_group(value);
-      value = negative + value;
-      var length = value.length;
-      if (length < width) value = new Array(width - length + 1).join(fill) + value;
-    }
-
-    return value + suffix;
-  };
-};
-
-// [[fill]align][sign][#][0][width][,][.precision][type]
-var d3_format_re = /(?:([^{])?([<>=^]))?([+\- ])?(#)?(0)?([0-9]+)?(,)?(\.[0-9]+)?([a-zA-Z%])?/;
-
-var d3_format_types = {
-  g: function(x, p) { return x.toPrecision(p); },
-  e: function(x, p) { return x.toExponential(p); },
-  f: function(x, p) { return x.toFixed(p); },
-  r: function(x, p) { return d3.round(x, p = d3_format_precision(x, p)).toFixed(Math.max(0, Math.min(20, p))); }
-};
-
-function d3_format_precision(x, p) {
-  return p - (x ? 1 + Math.floor(Math.log(x + Math.pow(10, 1 + Math.floor(Math.log(x) / Math.LN10) - p)) / Math.LN10) : 1);
-}
-
-function d3_format_typeDefault(x) {
-  return x + "";
-}
-
-// Apply comma grouping for thousands.
-function d3_format_group(value) {
-  var i = value.lastIndexOf("."),
-      f = i >= 0 ? value.substring(i) : (i = value.length, ""),
-      t = [];
-  while (i > 0) t.push(value.substring(i -= 3, i + 3));
-  return t.reverse().join(",") + f;
-}
-var d3_formatPrefixes = ["y","z","a","f","p","n","μ","m","","k","M","G","T","P","E","Z","Y"].map(d3_formatPrefix);
-
-d3.formatPrefix = function(value, precision) {
-  var i = 0;
-  if (value) {
-    if (value < 0) value *= -1;
-    if (precision) value = d3.round(value, d3_format_precision(value, precision));
-    i = 1 + Math.floor(1e-12 + Math.log(value) / Math.LN10);
-    i = Math.max(-24, Math.min(24, Math.floor((i <= 0 ? i + 1 : i - 1) / 3) * 3));
-  }
-  return d3_formatPrefixes[8 + i / 3];
-};
-
-function d3_formatPrefix(d, i) {
-  return {
-    scale: Math.pow(10, (8 - i) * 3),
-    symbol: d
-  };
-}
-
-/*
- * TERMS OF USE - EASING EQUATIONS
- *
- * Open source under the BSD License.
- *
- * Copyright 2001 Robert Penner
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * - Redistributions of source code must retain the above copyright notice, this
- *   list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright notice,
- *   this list of conditions and the following disclaimer in the documentation
- *   and/or other materials provided with the distribution.
- *
- * - Neither the name of the author nor the names of contributors may be used to
- *   endorse or promote products derived from this software without specific
- *   prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-var d3_ease_quad = d3_ease_poly(2),
-    d3_ease_cubic = d3_ease_poly(3);
-
-var d3_ease = {
-  linear: function() { return d3_ease_linear; },
-  poly: d3_ease_poly,
-  quad: function() { return d3_ease_quad; },
-  cubic: function() { return d3_ease_cubic; },
-  sin: function() { return d3_ease_sin; },
-  exp: function() { return d3_ease_exp; },
-  circle: function() { return d3_ease_circle; },
-  elastic: d3_ease_elastic,
-  back: d3_ease_back,
-  bounce: function() { return d3_ease_bounce; }
-};
-
-var d3_ease_mode = {
-  "in": function(f) { return f; },
-  "out": d3_ease_reverse,
-  "in-out": d3_ease_reflect,
-  "out-in": function(f) { return d3_ease_reflect(d3_ease_reverse(f)); }
-};
-
-d3.ease = function(name) {
-  var i = name.indexOf("-"),
-      t = i >= 0 ? name.substring(0, i) : name,
-      m = i >= 0 ? name.substring(i + 1) : "in";
-  return d3_ease_clamp(d3_ease_mode[m](d3_ease[t].apply(null, Array.prototype.slice.call(arguments, 1))));
-};
-
-function d3_ease_clamp(f) {
-  return function(t) {
-    return t <= 0 ? 0 : t >= 1 ? 1 : f(t);
-  };
-}
-
-function d3_ease_reverse(f) {
-  return function(t) {
-    return 1 - f(1 - t);
-  };
-}
-
-function d3_ease_reflect(f) {
-  return function(t) {
-    return .5 * (t < .5 ? f(2 * t) : (2 - f(2 - 2 * t)));
-  };
-}
-
-function d3_ease_linear(t) {
-  return t;
-}
-
-function d3_ease_poly(e) {
-  return function(t) {
-    return Math.pow(t, e);
-  }
-}
-
-function d3_ease_sin(t) {
-  return 1 - Math.cos(t * Math.PI / 2);
-}
-
-function d3_ease_exp(t) {
-  return Math.pow(2, 10 * (t - 1));
-}
-
-function d3_ease_circle(t) {
-  return 1 - Math.sqrt(1 - t * t);
-}
-
-function d3_ease_elastic(a, p) {
-  var s;
-  if (arguments.length < 2) p = 0.45;
-  if (arguments.length < 1) { a = 1; s = p / 4; }
-  else s = p / (2 * Math.PI) * Math.asin(1 / a);
-  return function(t) {
-    return 1 + a * Math.pow(2, 10 * -t) * Math.sin((t - s) * 2 * Math.PI / p);
-  };
-}
-
-function d3_ease_back(s) {
-  if (!s) s = 1.70158;
-  return function(t) {
-    return t * t * ((s + 1) * t - s);
-  };
-}
-
-function d3_ease_bounce(t) {
-  return t < 1 / 2.75 ? 7.5625 * t * t
-      : t < 2 / 2.75 ? 7.5625 * (t -= 1.5 / 2.75) * t + .75
-      : t < 2.5 / 2.75 ? 7.5625 * (t -= 2.25 / 2.75) * t + .9375
-      : 7.5625 * (t -= 2.625 / 2.75) * t + .984375;
-}
-d3.event = null;
-
-function d3_eventCancel() {
-  d3.event.stopPropagation();
-  d3.event.preventDefault();
-}
-d3.interpolate = function(a, b) {
-  var i = d3.interpolators.length, f;
-  while (--i >= 0 && !(f = d3.interpolators[i](a, b)));
-  return f;
-};
-
-d3.interpolateNumber = function(a, b) {
-  b -= a;
-  return function(t) { return a + b * t; };
-};
-
-d3.interpolateRound = function(a, b) {
-  b -= a;
-  return function(t) { return Math.round(a + b * t); };
-};
-
-d3.interpolateString = function(a, b) {
-  var m, // current match
-      i, // current index
-      j, // current index (for coallescing)
-      s0 = 0, // start index of current string prefix
-      s1 = 0, // end index of current string prefix
-      s = [], // string constants and placeholders
-      q = [], // number interpolators
-      n, // q.length
-      o;
-
-  // Reset our regular expression!
-  d3_interpolate_number.lastIndex = 0;
-
-  // Find all numbers in b.
-  for (i = 0; m = d3_interpolate_number.exec(b); ++i) {
-    if (m.index) s.push(b.substring(s0, s1 = m.index));
-    q.push({i: s.length, x: m[0]});
-    s.push(null);
-    s0 = d3_interpolate_number.lastIndex;
-  }
-  if (s0 < b.length) s.push(b.substring(s0));
-
-  // Find all numbers in a.
-  for (i = 0, n = q.length; (m = d3_interpolate_number.exec(a)) && i < n; ++i) {
-    o = q[i];
-    if (o.x == m[0]) { // The numbers match, so coallesce.
-      if (o.i) {
-        if (s[o.i + 1] == null) { // This match is followed by another number.
-          s[o.i - 1] += o.x;
-          s.splice(o.i, 1);
-          for (j = i + 1; j < n; ++j) q[j].i--;
-        } else { // This match is followed by a string, so coallesce twice.
-          s[o.i - 1] += o.x + s[o.i + 1];
-          s.splice(o.i, 2);
-          for (j = i + 1; j < n; ++j) q[j].i -= 2;
-        }
-      } else {
-          if (s[o.i + 1] == null) { // This match is followed by another number.
-          s[o.i] = o.x;
-        } else { // This match is followed by a string, so coallesce twice.
-          s[o.i] = o.x + s[o.i + 1];
-          s.splice(o.i + 1, 1);
-          for (j = i + 1; j < n; ++j) q[j].i--;
-        }
-      }
-      q.splice(i, 1);
-      n--;
-      i--;
-    } else {
-      o.x = d3.interpolateNumber(parseFloat(m[0]), parseFloat(o.x));
-    }
-  }
-
-  // Remove any numbers in b not found in a.
-  while (i < n) {
-    o = q.pop();
-    if (s[o.i + 1] == null) { // This match is followed by another number.
-      s[o.i] = o.x;
-    } else { // This match is followed by a string, so coallesce twice.
-      s[o.i] = o.x + s[o.i + 1];
-      s.splice(o.i + 1, 1);
-    }
-    n--;
-  }
-
-  // Special optimization for only a single match.
-  if (s.length === 1) {
-    return s[0] == null ? q[0].x : function() { return b; };
-  }
-
-  // Otherwise, interpolate each of the numbers and rejoin the string.
-  return function(t) {
-    for (i = 0; i < n; ++i) s[(o = q[i]).i] = o.x(t);
-    return s.join("");
-  };
-};
-
-d3.interpolateTransform = function(a, b) {
-  return d3.interpolateString(d3.transform(a) + "", d3.transform(b) + "");
-};
-
-d3.interpolateRgb = function(a, b) {
-  a = d3.rgb(a);
-  b = d3.rgb(b);
-  var ar = a.r,
-      ag = a.g,
-      ab = a.b,
-      br = b.r - ar,
-      bg = b.g - ag,
-      bb = b.b - ab;
-  return function(t) {
-    return "#"
-        + d3_rgb_hex(Math.round(ar + br * t))
-        + d3_rgb_hex(Math.round(ag + bg * t))
-        + d3_rgb_hex(Math.round(ab + bb * t));
-  };
-};
-
-// interpolates HSL space, but outputs RGB string (for compatibility)
-d3.interpolateHsl = function(a, b) {
-  a = d3.hsl(a);
-  b = d3.hsl(b);
-  var h0 = a.h,
-      s0 = a.s,
-      l0 = a.l,
-      h1 = b.h - h0,
-      s1 = b.s - s0,
-      l1 = b.l - l0;
-  return function(t) {
-    return d3_hsl_rgb(h0 + h1 * t, s0 + s1 * t, l0 + l1 * t).toString();
-  };
-};
-
-d3.interpolateArray = function(a, b) {
-  var x = [],
-      c = [],
-      na = a.length,
-      nb = b.length,
-      n0 = Math.min(a.length, b.length),
-      i;
-  for (i = 0; i < n0; ++i) x.push(d3.interpolate(a[i], b[i]));
-  for (; i < na; ++i) c[i] = a[i];
-  for (; i < nb; ++i) c[i] = b[i];
-  return function(t) {
-    for (i = 0; i < n0; ++i) c[i] = x[i](t);
-    return c;
-  };
-};
-
-d3.interpolateObject = function(a, b) {
-  var i = {},
-      c = {},
-      k;
-  for (k in a) {
-    if (k in b) {
-      i[k] = d3_interpolateByName(k)(a[k], b[k]);
-    } else {
-      c[k] = a[k];
-    }
-  }
-  for (k in b) {
-    if (!(k in a)) {
-      c[k] = b[k];
-    }
-  }
-  return function(t) {
-    for (k in i) c[k] = i[k](t);
-    return c;
-  };
-}
-
-var d3_interpolate_number = /[-+]?(?:\d*\.?\d+)(?:[eE][-+]?\d+)?/g;
-
-function d3_interpolateByName(n) {
-  return n == "transform"
-      ? d3.interpolateTransform
-      : d3.interpolate;
-}
-
-d3.interpolators = [
-  d3.interpolateObject,
-  function(a, b) { return (b instanceof Array) && d3.interpolateArray(a, b); },
-  function(a, b) { return (typeof a === "string" || typeof b === "string") && d3.interpolateString(a + "", b + ""); },
-  function(a, b) { return (typeof b === "string" ? b in d3_rgb_names || /^(#|rgb\(|hsl\()/.test(b) : b instanceof d3_Rgb || b instanceof d3_Hsl) && d3.interpolateRgb(a, b); },
-  function(a, b) { return !isNaN(a = +a) && !isNaN(b = +b) && d3.interpolateNumber(a, b); }
-];
-function d3_uninterpolateNumber(a, b) {
-  b = b - (a = +a) ? 1 / (b - a) : 0;
-  return function(x) { return (x - a) * b; };
-}
-
-function d3_uninterpolateClamp(a, b) {
-  b = b - (a = +a) ? 1 / (b - a) : 0;
-  return function(x) { return Math.max(0, Math.min(1, (x - a) * b)); };
-}
-d3.rgb = function(r, g, b) {
-  return arguments.length === 1
-      ? (r instanceof d3_Rgb ? d3_rgb(r.r, r.g, r.b)
-      : d3_rgb_parse("" + r, d3_rgb, d3_hsl_rgb))
-      : d3_rgb(~~r, ~~g, ~~b);
-};
-
-function d3_rgb(r, g, b) {
-  return new d3_Rgb(r, g, b);
-}
-
-function d3_Rgb(r, g, b) {
-  this.r = r;
-  this.g = g;
-  this.b = b;
-}
-
-d3_Rgb.prototype.brighter = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  var r = this.r,
-      g = this.g,
-      b = this.b,
-      i = 30;
-  if (!r && !g && !b) return d3_rgb(i, i, i);
-  if (r && r < i) r = i;
-  if (g && g < i) g = i;
-  if (b && b < i) b = i;
-  return d3_rgb(
-      Math.min(255, Math.floor(r / k)),
-      Math.min(255, Math.floor(g / k)),
-      Math.min(255, Math.floor(b / k)));
-};
-
-d3_Rgb.prototype.darker = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  return d3_rgb(
-      Math.floor(k * this.r),
-      Math.floor(k * this.g),
-      Math.floor(k * this.b));
-};
-
-d3_Rgb.prototype.hsl = function() {
-  return d3_rgb_hsl(this.r, this.g, this.b);
-};
-
-d3_Rgb.prototype.toString = function() {
-  return "#" + d3_rgb_hex(this.r) + d3_rgb_hex(this.g) + d3_rgb_hex(this.b);
-};
-
-function d3_rgb_hex(v) {
-  return v < 0x10
-      ? "0" + Math.max(0, v).toString(16)
-      : Math.min(255, v).toString(16);
-}
-
-function d3_rgb_parse(format, rgb, hsl) {
-  var r = 0, // red channel; int in [0, 255]
-      g = 0, // green channel; int in [0, 255]
-      b = 0, // blue channel; int in [0, 255]
-      m1, // CSS color specification match
-      m2, // CSS color specification type (e.g., rgb)
-      name;
-
-  /* Handle hsl, rgb. */
-  m1 = /([a-z]+)\((.*)\)/i.exec(format);
-  if (m1) {
-    m2 = m1[2].split(",");
-    switch (m1[1]) {
-      case "hsl": {
-        return hsl(
-          parseFloat(m2[0]), // degrees
-          parseFloat(m2[1]) / 100, // percentage
-          parseFloat(m2[2]) / 100 // percentage
-        );
-      }
-      case "rgb": {
-        return rgb(
-          d3_rgb_parseNumber(m2[0]),
-          d3_rgb_parseNumber(m2[1]),
-          d3_rgb_parseNumber(m2[2])
-        );
-      }
-    }
-  }
-
-  /* Named colors. */
-  if (name = d3_rgb_names[format]) return rgb(name.r, name.g, name.b);
-
-  /* Hexadecimal colors: #rgb and #rrggbb. */
-  if (format != null && format.charAt(0) === "#") {
-    if (format.length === 4) {
-      r = format.charAt(1); r += r;
-      g = format.charAt(2); g += g;
-      b = format.charAt(3); b += b;
-    } else if (format.length === 7) {
-      r = format.substring(1, 3);
-      g = format.substring(3, 5);
-      b = format.substring(5, 7);
-    }
-    r = parseInt(r, 16);
-    g = parseInt(g, 16);
-    b = parseInt(b, 16);
-  }
-
-  return rgb(r, g, b);
-}
-
-function d3_rgb_hsl(r, g, b) {
-  var min = Math.min(r /= 255, g /= 255, b /= 255),
-      max = Math.max(r, g, b),
-      d = max - min,
-      h,
-      s,
-      l = (max + min) / 2;
-  if (d) {
-    s = l < .5 ? d / (max + min) : d / (2 - max - min);
-    if (r == max) h = (g - b) / d + (g < b ? 6 : 0);
-    else if (g == max) h = (b - r) / d + 2;
-    else h = (r - g) / d + 4;
-    h *= 60;
-  } else {
-    s = h = 0;
-  }
-  return d3_hsl(h, s, l);
-}
-
-function d3_rgb_parseNumber(c) { // either integer or percentage
-  var f = parseFloat(c);
-  return c.charAt(c.length - 1) === "%" ? Math.round(f * 2.55) : f;
-}
-
-var d3_rgb_names = {
-  aliceblue: "#f0f8ff",
-  antiquewhite: "#faebd7",
-  aqua: "#00ffff",
-  aquamarine: "#7fffd4",
-  azure: "#f0ffff",
-  beige: "#f5f5dc",
-  bisque: "#ffe4c4",
-  black: "#000000",
-  blanchedalmond: "#ffebcd",
-  blue: "#0000ff",
-  blueviolet: "#8a2be2",
-  brown: "#a52a2a",
-  burlywood: "#deb887",
-  cadetblue: "#5f9ea0",
-  chartreuse: "#7fff00",
-  chocolate: "#d2691e",
-  coral: "#ff7f50",
-  cornflowerblue: "#6495ed",
-  cornsilk: "#fff8dc",
-  crimson: "#dc143c",
-  cyan: "#00ffff",
-  darkblue: "#00008b",
-  darkcyan: "#008b8b",
-  darkgoldenrod: "#b8860b",
-  darkgray: "#a9a9a9",
-  darkgreen: "#006400",
-  darkgrey: "#a9a9a9",
-  darkkhaki: "#bdb76b",
-  darkmagenta: "#8b008b",
-  darkolivegreen: "#556b2f",
-  darkorange: "#ff8c00",
-  darkorchid: "#9932cc",
-  darkred: "#8b0000",
-  darksalmon: "#e9967a",
-  darkseagreen: "#8fbc8f",
-  darkslateblue: "#483d8b",
-  darkslategray: "#2f4f4f",
-  darkslategrey: "#2f4f4f",
-  darkturquoise: "#00ced1",
-  darkviolet: "#9400d3",
-  deeppink: "#ff1493",
-  deepskyblue: "#00bfff",
-  dimgray: "#696969",
-  dimgrey: "#696969",
-  dodgerblue: "#1e90ff",
-  firebrick: "#b22222",
-  floralwhite: "#fffaf0",
-  forestgreen: "#228b22",
-  fuchsia: "#ff00ff",
-  gainsboro: "#dcdcdc",
-  ghostwhite: "#f8f8ff",
-  gold: "#ffd700",
-  goldenrod: "#daa520",
-  gray: "#808080",
-  green: "#008000",
-  greenyellow: "#adff2f",
-  grey: "#808080",
-  honeydew: "#f0fff0",
-  hotpink: "#ff69b4",
-  indianred: "#cd5c5c",
-  indigo: "#4b0082",
-  ivory: "#fffff0",
-  khaki: "#f0e68c",
-  lavender: "#e6e6fa",
-  lavenderblush: "#fff0f5",
-  lawngreen: "#7cfc00",
-  lemonchiffon: "#fffacd",
-  lightblue: "#add8e6",
-  lightcoral: "#f08080",
-  lightcyan: "#e0ffff",
-  lightgoldenrodyellow: "#fafad2",
-  lightgray: "#d3d3d3",
-  lightgreen: "#90ee90",
-  lightgrey: "#d3d3d3",
-  lightpink: "#ffb6c1",
-  lightsalmon: "#ffa07a",
-  lightseagreen: "#20b2aa",
-  lightskyblue: "#87cefa",
-  lightslategray: "#778899",
-  lightslategrey: "#778899",
-  lightsteelblue: "#b0c4de",
-  lightyellow: "#ffffe0",
-  lime: "#00ff00",
-  limegreen: "#32cd32",
-  linen: "#faf0e6",
-  magenta: "#ff00ff",
-  maroon: "#800000",
-  mediumaquamarine: "#66cdaa",
-  mediumblue: "#0000cd",
-  mediumorchid: "#ba55d3",
-  mediumpurple: "#9370db",
-  mediumseagreen: "#3cb371",
-  mediumslateblue: "#7b68ee",
-  mediumspringgreen: "#00fa9a",
-  mediumturquoise: "#48d1cc",
-  mediumvioletred: "#c71585",
-  midnightblue: "#191970",
-  mintcream: "#f5fffa",
-  mistyrose: "#ffe4e1",
-  moccasin: "#ffe4b5",
-  navajowhite: "#ffdead",
-  navy: "#000080",
-  oldlace: "#fdf5e6",
-  olive: "#808000",
-  olivedrab: "#6b8e23",
-  orange: "#ffa500",
-  orangered: "#ff4500",
-  orchid: "#da70d6",
-  palegoldenrod: "#eee8aa",
-  palegreen: "#98fb98",
-  paleturquoise: "#afeeee",
-  palevioletred: "#db7093",
-  papayawhip: "#ffefd5",
-  peachpuff: "#ffdab9",
-  peru: "#cd853f",
-  pink: "#ffc0cb",
-  plum: "#dda0dd",
-  powderblue: "#b0e0e6",
-  purple: "#800080",
-  red: "#ff0000",
-  rosybrown: "#bc8f8f",
-  royalblue: "#4169e1",
-  saddlebrown: "#8b4513",
-  salmon: "#fa8072",
-  sandybrown: "#f4a460",
-  seagreen: "#2e8b57",
-  seashell: "#fff5ee",
-  sienna: "#a0522d",
-  silver: "#c0c0c0",
-  skyblue: "#87ceeb",
-  slateblue: "#6a5acd",
-  slategray: "#708090",
-  slategrey: "#708090",
-  snow: "#fffafa",
-  springgreen: "#00ff7f",
-  steelblue: "#4682b4",
-  tan: "#d2b48c",
-  teal: "#008080",
-  thistle: "#d8bfd8",
-  tomato: "#ff6347",
-  turquoise: "#40e0d0",
-  violet: "#ee82ee",
-  wheat: "#f5deb3",
-  white: "#ffffff",
-  whitesmoke: "#f5f5f5",
-  yellow: "#ffff00",
-  yellowgreen: "#9acd32"
-};
-
-for (var d3_rgb_name in d3_rgb_names) {
-  d3_rgb_names[d3_rgb_name] = d3_rgb_parse(
-      d3_rgb_names[d3_rgb_name],
-      d3_rgb,
-      d3_hsl_rgb);
-}
-d3.hsl = function(h, s, l) {
-  return arguments.length === 1
-      ? (h instanceof d3_Hsl ? d3_hsl(h.h, h.s, h.l)
-      : d3_rgb_parse("" + h, d3_rgb_hsl, d3_hsl))
-      : d3_hsl(+h, +s, +l);
-};
-
-function d3_hsl(h, s, l) {
-  return new d3_Hsl(h, s, l);
-}
-
-function d3_Hsl(h, s, l) {
-  this.h = h;
-  this.s = s;
-  this.l = l;
-}
-
-d3_Hsl.prototype.brighter = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  return d3_hsl(this.h, this.s, this.l / k);
-};
-
-d3_Hsl.prototype.darker = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  return d3_hsl(this.h, this.s, k * this.l);
-};
-
-d3_Hsl.prototype.rgb = function() {
-  return d3_hsl_rgb(this.h, this.s, this.l);
-};
-
-d3_Hsl.prototype.toString = function() {
-  return this.rgb().toString();
-};
-
-function d3_hsl_rgb(h, s, l) {
-  var m1,
-      m2;
-
-  /* Some simple corrections for h, s and l. */
-  h = h % 360; if (h < 0) h += 360;
-  s = s < 0 ? 0 : s > 1 ? 1 : s;
-  l = l < 0 ? 0 : l > 1 ? 1 : l;
-
-  /* From FvD 13.37, CSS Color Module Level 3 */
-  m2 = l <= .5 ? l * (1 + s) : l + s - l * s;
-  m1 = 2 * l - m2;
-
-  function v(h) {
-    if (h > 360) h -= 360;
-    else if (h < 0) h += 360;
-    if (h < 60) return m1 + (m2 - m1) * h / 60;
-    if (h < 180) return m2;
-    if (h < 240) return m1 + (m2 - m1) * (240 - h) / 60;
-    return m1;
-  }
-
-  function vv(h) {
-    return Math.round(v(h) * 255);
-  }
-
-  return d3_rgb(vv(h + 120), vv(h), vv(h - 120));
-}
-function d3_selection(groups) {
-  d3_arraySubclass(groups, d3_selectionPrototype);
-  return groups;
-}
-
-var d3_select = function(s, n) { return n.querySelector(s); },
-    d3_selectAll = function(s, n) { return n.querySelectorAll(s); };
-
-// Prefer Sizzle, if available.
-if (typeof Sizzle === "function") {
-  d3_select = function(s, n) { return Sizzle(s, n)[0]; };
-  d3_selectAll = function(s, n) { return Sizzle.uniqueSort(Sizzle(s, n)); };
-}
-
-var d3_selectionPrototype = [];
-
-d3.selection = function() {
-  return d3_selectionRoot;
-};
-
-d3.selection.prototype = d3_selectionPrototype;
-d3_selectionPrototype.select = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnode,
-      group,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selector(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    subgroups.push(subgroup = []);
-    subgroup.parentNode = (group = this[j]).parentNode;
-    for (var i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subgroup.push(subnode = selector.call(node, node.__data__, i));
-        if (subnode && "__data__" in node) subnode.__data__ = node.__data__;
-      } else {
-        subgroup.push(null);
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-
-function d3_selection_selector(selector) {
-  return function() {
-    return d3_select(selector, this);
-  };
-}
-d3_selectionPrototype.selectAll = function(selector) {
-  var subgroups = [],
-      subgroup,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subgroups.push(subgroup = d3_array(selector.call(node, node.__data__, i)));
-        subgroup.parentNode = node;
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-
-function d3_selection_selectorAll(selector) {
-  return function() {
-    return d3_selectAll(selector, this);
-  };
-}
-d3_selectionPrototype.attr = function(name, value) {
-  name = d3.ns.qualify(name);
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) {
-    var node = this.node();
-    return name.local
-        ? node.getAttributeNS(name.space, name.local)
-        : node.getAttribute(name);
-  }
-
-  function attrNull() {
-    this.removeAttribute(name);
-  }
-
-  function attrNullNS() {
-    this.removeAttributeNS(name.space, name.local);
-  }
-
-  function attrConstant() {
-    this.setAttribute(name, value);
-  }
-
-  function attrConstantNS() {
-    this.setAttributeNS(name.space, name.local, value);
-  }
-
-  function attrFunction() {
-    var x = value.apply(this, arguments);
-    if (x == null) this.removeAttribute(name);
-    else this.setAttribute(name, x);
-  }
-
-  function attrFunctionNS() {
-    var x = value.apply(this, arguments);
-    if (x == null) this.removeAttributeNS(name.space, name.local);
-    else this.setAttributeNS(name.space, name.local, x);
-  }
-
-  return this.each(value == null
-      ? (name.local ? attrNullNS : attrNull) : (typeof value === "function"
-      ? (name.local ? attrFunctionNS : attrFunction)
-      : (name.local ? attrConstantNS : attrConstant)));
-};
-d3_selectionPrototype.classed = function(name, value) {
-  var names = name.split(d3_selection_classedWhitespace),
-      n = names.length,
-      i = -1;
-  if (arguments.length > 1) {
-    while (++i < n) d3_selection_classed.call(this, names[i], value);
-    return this;
-  } else {
-    while (++i < n) if (!d3_selection_classed.call(this, names[i])) return false;
-    return true;
-  }
-};
-
-var d3_selection_classedWhitespace = /\s+/g;
-
-function d3_selection_classed(name, value) {
-  var re = new RegExp("(^|\\s+)" + d3.requote(name) + "(\\s+|$)", "g");
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) {
-    var node = this.node();
-    if (c = node.classList) return c.contains(name);
-    var c = node.className;
-    re.lastIndex = 0;
-    return re.test(c.baseVal != null ? c.baseVal : c);
-  }
-
-  function classedAdd() {
-    if (c = this.classList) return c.add(name);
-    var c = this.className,
-        cb = c.baseVal != null,
-        cv = cb ? c.baseVal : c;
-    re.lastIndex = 0;
-    if (!re.test(cv)) {
-      cv = d3_collapse(cv + " " + name);
-      if (cb) c.baseVal = cv;
-      else this.className = cv;
-    }
-  }
-
-  function classedRemove() {
-    if (c = this.classList) return c.remove(name);
-    var c = this.className,
-        cb = c.baseVal != null,
-        cv = cb ? c.baseVal : c;
-    cv = d3_collapse(cv.replace(re, " "));
-    if (cb) c.baseVal = cv;
-    else this.className = cv;
-  }
-
-  function classedFunction() {
-    (value.apply(this, arguments)
-        ? classedAdd
-        : classedRemove).call(this);
-  }
-
-  return this.each(typeof value === "function"
-      ? classedFunction : value
-      ? classedAdd
-      : classedRemove);
-}
-d3_selectionPrototype.style = function(name, value, priority) {
-  if (arguments.length < 3) priority = "";
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) return window
-      .getComputedStyle(this.node(), null)
-      .getPropertyValue(name);
-
-  function styleNull() {
-    this.style.removeProperty(name);
-  }
-
-  function styleConstant() {
-    this.style.setProperty(name, value, priority);
-  }
-
-  function styleFunction() {
-    var x = value.apply(this, arguments);
-    if (x == null) this.style.removeProperty(name);
-    else this.style.setProperty(name, x, priority);
-  }
-
-  return this.each(value == null
-      ? styleNull : (typeof value === "function"
-      ? styleFunction : styleConstant));
-};
-d3_selectionPrototype.property = function(name, value) {
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) return this.node()[name];
-
-  function propertyNull() {
-    delete this[name];
-  }
-
-  function propertyConstant() {
-    this[name] = value;
-  }
-
-  function propertyFunction() {
-    var x = value.apply(this, arguments);
-    if (x == null) delete this[name];
-    else this[name] = x;
-  }
-
-  return this.each(value == null
-      ? propertyNull : (typeof value === "function"
-      ? propertyFunction : propertyConstant));
-};
-d3_selectionPrototype.text = function(value) {
-  return arguments.length < 1 ? this.node().textContent
-      : (this.each(typeof value === "function"
-      ? function() { this.textContent = value.apply(this, arguments); }
-      : function() { this.textContent = value; }));
-};
-d3_selectionPrototype.html = function(value) {
-  return arguments.length < 1 ? this.node().innerHTML
-      : (this.each(typeof value === "function"
-      ? function() { this.innerHTML = value.apply(this, arguments); }
-      : function() { this.innerHTML = value; }));
-};
-// TODO append(node)?
-// TODO append(function)?
-d3_selectionPrototype.append = function(name) {
-  name = d3.ns.qualify(name);
-
-  function append() {
-    return this.appendChild(document.createElementNS(this.namespaceURI, name));
-  }
-
-  function appendNS() {
-    return this.appendChild(document.createElementNS(name.space, name.local));
-  }
-
-  return this.select(name.local ? appendNS : append);
-};
-// TODO insert(node, function)?
-// TODO insert(function, string)?
-// TODO insert(function, function)?
-d3_selectionPrototype.insert = function(name, before) {
-  name = d3.ns.qualify(name);
-
-  function insert() {
-    return this.insertBefore(
-        document.createElementNS(this.namespaceURI, name),
-        d3_select(before, this));
-  }
-
-  function insertNS() {
-    return this.insertBefore(
-        document.createElementNS(name.space, name.local),
-        d3_select(before, this));
-  }
-
-  return this.select(name.local ? insertNS : insert);
-};
-// TODO remove(selector)?
-// TODO remove(node)?
-// TODO remove(function)?
-d3_selectionPrototype.remove = function() {
-  return this.each(function() {
-    var parent = this.parentNode;
-    if (parent) parent.removeChild(this);
-  });
-};
-// TODO data(null) for clearing data?
-d3_selectionPrototype.data = function(data, join) {
-  var enter = [],
-      update = [],
-      exit = [];
-
-  function bind(group, groupData) {
-    var i,
-        n = group.length,
-        m = groupData.length,
-        n0 = Math.min(n, m),
-        n1 = Math.max(n, m),
-        updateNodes = [],
-        enterNodes = [],
-        exitNodes = [],
-        node,
-        nodeData;
-
-    if (join) {
-      var nodeByKey = {},
-          keys = [],
-          key,
-          j = groupData.length;
-
-      for (i = -1; ++i < n;) {
-        key = join.call(node = group[i], node.__data__, i);
-        if (key in nodeByKey) {
-          exitNodes[j++] = node; // duplicate key
-        } else {
-          nodeByKey[key] = node;
-        }
-        keys.push(key);
-      }
-
-      for (i = -1; ++i < m;) {
-        node = nodeByKey[key = join.call(groupData, nodeData = groupData[i], i)];
-        if (node) {
-          node.__data__ = nodeData;
-          updateNodes[i] = node;
-          enterNodes[i] = exitNodes[i] = null;
-        } else {
-          enterNodes[i] = d3_selection_dataNode(nodeData);
-          updateNodes[i] = exitNodes[i] = null;
-        }
-        delete nodeByKey[key];
-      }
-
-      for (i = -1; ++i < n;) {
-        if (keys[i] in nodeByKey) {
-          exitNodes[i] = group[i];
-        }
-      }
-    } else {
-      for (i = -1; ++i < n0;) {
-        node = group[i];
-        nodeData = groupData[i];
-        if (node) {
-          node.__data__ = nodeData;
-          updateNodes[i] = node;
-          enterNodes[i] = exitNodes[i] = null;
-        } else {
-          enterNodes[i] = d3_selection_dataNode(nodeData);
-          updateNodes[i] = exitNodes[i] = null;
-        }
-      }
-      for (; i < m; ++i) {
-        enterNodes[i] = d3_selection_dataNode(groupData[i]);
-        updateNodes[i] = exitNodes[i] = null;
-      }
-      for (; i < n1; ++i) {
-        exitNodes[i] = group[i];
-        enterNodes[i] = updateNodes[i] = null;
-      }
-    }
-
-    enterNodes.update
-        = updateNodes;
-
-    enterNodes.parentNode
-        = updateNodes.parentNode
-        = exitNodes.parentNode
-        = group.parentNode;
-
-    enter.push(enterNodes);
-    update.push(updateNodes);
-    exit.push(exitNodes);
-  }
-
-  var i = -1,
-      n = this.length,
-      group;
-  if (typeof data === "function") {
-    while (++i < n) {
-      bind(group = this[i], data.call(group, group.parentNode.__data__, i));
-    }
-  } else {
-    while (++i < n) {
-      bind(group = this[i], data);
-    }
-  }
-
-  var selection = d3_selection(update);
-  selection.enter = function() { return d3_selection_enter(enter); };
-  selection.exit = function() { return d3_selection(exit); };
-  return selection;
-};
-
-function d3_selection_dataNode(data) {
-  return {__data__: data};
-}
-// TODO preserve null elements to maintain index?
-d3_selectionPrototype.filter = function(filter) {
-  var subgroups = [],
-      subgroup,
-      group,
-      node;
-
-  for (var j = 0, m = this.length; j < m; j++) {
-    subgroups.push(subgroup = []);
-    subgroup.parentNode = (group = this[j]).parentNode;
-    for (var i = 0, n = group.length; i < n; i++) {
-      if ((node = group[i]) && filter.call(node, node.__data__, i)) {
-        subgroup.push(node);
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-d3_selectionPrototype.map = function(map) {
-  return this.each(function() {
-    this.__data__ = map.apply(this, arguments);
-  });
-};
-d3_selectionPrototype.sort = function(comparator) {
-  comparator = d3_selection_sortComparator.apply(this, arguments);
-  for (var j = 0, m = this.length; j < m; j++) {
-    for (var group = this[j].sort(comparator), i = 1, n = group.length, prev = group[0]; i < n; i++) {
-      var node = group[i];
-      if (node) {
-        if (prev) prev.parentNode.insertBefore(node, prev.nextSibling);
-        prev = node;
-      }
-    }
-  }
-  return this;
-};
-
-function d3_selection_sortComparator(comparator) {
-  if (!arguments.length) comparator = d3.ascending;
-  return function(a, b) {
-    return comparator(a && a.__data__, b && b.__data__);
-  };
-}
-// type can be namespaced, e.g., "click.foo"
-// listener can be null for removal
-d3_selectionPrototype.on = function(type, listener, capture) {
-  if (arguments.length < 3) capture = false;
-
-  // parse the type specifier
-  var name = "__on" + type, i = type.indexOf(".");
-  if (i > 0) type = type.substring(0, i);
-
-  // if called with only one argument, return the current listener
-  if (arguments.length < 2) return (i = this.node()[name]) && i._;
-
-  // remove the old event listener, and add the new event listener
-  return this.each(function(d, i) {
-    var node = this;
-
-    if (node[name]) node.removeEventListener(type, node[name], capture);
-    if (listener) node.addEventListener(type, node[name] = l, capture);
-
-    // wrapped event listener that preserves i
-    function l(e) {
-      var o = d3.event; // Events can be reentrant (e.g., focus).
-      d3.event = e;
-      try {
-        listener.call(node, node.__data__, i);
-      } finally {
-        d3.event = o;
-      }
-    }
-
-    // stash the unwrapped listener for retrieval
-    l._ = listener;
-  });
-};
-d3_selectionPrototype.each = function(callback) {
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      var node = group[i];
-      if (node) callback.call(node, node.__data__, i, j);
-    }
-  }
-  return this;
-};
-//
-// Note: assigning to the arguments array simultaneously changes the value of
-// the corresponding argument!
-//
-// TODO The `this` argument probably shouldn't be the first argument to the
-// callback, anyway, since it's redundant. However, that will require a major
-// version bump due to backwards compatibility, so I'm not changing it right
-// away.
-//
-d3_selectionPrototype.call = function(callback) {
-  callback.apply(this, (arguments[0] = this, arguments));
-  return this;
-};
-d3_selectionPrototype.empty = function() {
-  return !this.node();
-};
-d3_selectionPrototype.node = function(callback) {
-  for (var j = 0, m = this.length; j < m; j++) {
-    for (var group = this[j], i = 0, n = group.length; i < n; i++) {
-      var node = group[i];
-      if (node) return node;
-    }
-  }
-  return null;
-};
-d3_selectionPrototype.transition = function() {
-  var subgroups = [],
-      subgroup,
-      node;
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    subgroups.push(subgroup = []);
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      subgroup.push((node = group[i]) ? {node: node, delay: 0, duration: 250} : null);
-    }
-  }
-
-  return d3_transition(subgroups, d3_transitionInheritId || ++d3_transitionId, Date.now());
-};
-var d3_selectionRoot = d3_selection([[document]]);
-
-d3_selectionRoot[0].parentNode = document.documentElement;
-
-// TODO fast singleton implementation!
-// TODO select(function)
-d3.select = function(selector) {
-  return typeof selector === "string"
-      ? d3_selectionRoot.select(selector)
-      : d3_selection([[selector]]); // assume node
-};
-
-// TODO selectAll(function)
-d3.selectAll = function(selector) {
-  return typeof selector === "string"
-      ? d3_selectionRoot.selectAll(selector)
-      : d3_selection([d3_array(selector)]); // assume node[]
-};
-function d3_selection_enter(selection) {
-  d3_arraySubclass(selection, d3_selection_enterPrototype);
-  return selection;
-}
-
-var d3_selection_enterPrototype = [];
-
-d3_selection_enterPrototype.append = d3_selectionPrototype.append;
-d3_selection_enterPrototype.insert = d3_selectionPrototype.insert;
-d3_selection_enterPrototype.empty = d3_selectionPrototype.empty;
-d3_selection_enterPrototype.node = d3_selectionPrototype.node;
-d3_selection_enterPrototype.select = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnode,
-      upgroup,
-      group,
-      node;
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    upgroup = (group = this[j]).update;
-    subgroups.push(subgroup = []);
-    subgroup.parentNode = group.parentNode;
-    for (var i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subgroup.push(upgroup[i] = subnode = selector.call(group.parentNode, node.__data__, i));
-        subnode.__data__ = node.__data__;
-      } else {
-        subgroup.push(null);
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-function d3_transition(groups, id, time) {
-  d3_arraySubclass(groups, d3_transitionPrototype);
-
-  var tweens = {},
-      event = d3.dispatch("start", "end"),
-      ease = d3_transitionEase;
-
-  groups.id = id;
-
-  groups.time = time;
-
-  groups.tween = function(name, tween) {
-    if (arguments.length < 2) return tweens[name];
-    if (tween == null) delete tweens[name];
-    else tweens[name] = tween;
-    return groups;
-  };
-
-  groups.ease = function(value) {
-    if (!arguments.length) return ease;
-    ease = typeof value === "function" ? value : d3.ease.apply(d3, arguments);
-    return groups;
-  };
-
-  groups.each = function(type, listener) {
-    if (arguments.length < 2) return d3_transition_each.call(groups, type);
-    event.on(type, listener);
-    return groups;
-  };
-
-  d3.timer(function(elapsed) {
-    groups.each(function(d, i, j) {
-      var tweened = [],
-          node = this,
-          delay = groups[j][i].delay,
-          duration = groups[j][i].duration,
-          lock = node.__transition__ || (node.__transition__ = {active: 0, count: 0});
-
-      ++lock.count;
-
-      delay <= elapsed ? start(elapsed) : d3.timer(start, delay, time);
-
-      function start(elapsed) {
-        if (lock.active > id) return stop();
-        lock.active = id;
-
-        for (var tween in tweens) {
-          if (tween = tweens[tween].call(node, d, i)) {
-            tweened.push(tween);
-          }
-        }
-
-        event.start.call(node, d, i);
-        if (!tick(elapsed)) d3.timer(tick, 0, time);
-        return 1;
-      }
-
-      function tick(elapsed) {
-        if (lock.active !== id) return stop();
-
-        var t = (elapsed - delay) / duration,
-            e = ease(t),
-            n = tweened.length;
-
-        while (n > 0) {
-          tweened[--n].call(node, e);
-        }
-
-        if (t >= 1) {
-          stop();
-          d3_transitionInheritId = id;
-          event.end.call(node, d, i);
-          d3_transitionInheritId = 0;
-          return 1;
-        }
-      }
-
-      function stop() {
-        if (!--lock.count) delete node.__transition__;
-        return 1;
-      }
-    });
-    return 1;
-  }, 0, time);
-
-  return groups;
-}
-
-var d3_transitionRemove = {};
-
-function d3_transitionNull(d, i, a) {
-  return a != "" && d3_transitionRemove;
-}
-
-function d3_transitionTween(name, b) {
-  var interpolate = d3_interpolateByName(name);
-
-  function transitionFunction(d, i, a) {
-    var v = b.call(this, d, i);
-    return v == null
-        ? a != "" && d3_transitionRemove
-        : a != v && interpolate(a, v);
-  }
-
-  function transitionString(d, i, a) {
-    return a != b && interpolate(a, b);
-  }
-
-  return typeof b === "function" ? transitionFunction
-      : b == null ? d3_transitionNull
-      : (b += "", transitionString);
-}
-
-var d3_transitionPrototype = [],
-    d3_transitionId = 0,
-    d3_transitionInheritId = 0,
-    d3_transitionEase = d3.ease("cubic-in-out");
-
-d3_transitionPrototype.call = d3_selectionPrototype.call;
-
-d3.transition = function() {
-  return d3_selectionRoot.transition();
-};
-
-d3.transition.prototype = d3_transitionPrototype;
-d3_transitionPrototype.select = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnode,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selector(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    subgroups.push(subgroup = []);
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      if ((node = group[i]) && (subnode = selector.call(node.node, node.node.__data__, i))) {
-        if ("__data__" in node.node) subnode.__data__ = node.node.__data__;
-        subgroup.push({node: subnode, delay: node.delay, duration: node.duration});
-      } else {
-        subgroup.push(null);
-      }
-    }
-  }
-
-  return d3_transition(subgroups, this.id, this.time).ease(this.ease());
-};
-d3_transitionPrototype.selectAll = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnodes,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subnodes = selector.call(node.node, node.node.__data__, i);
-        subgroups.push(subgroup = []);
-        for (var k = -1, o = subnodes.length; ++k < o;) {
-          subgroup.push({node: subnodes[k], delay: node.delay, duration: node.duration});
-        }
-      }
-    }
-  }
-
-  return d3_transition(subgroups, this.id, this.time).ease(this.ease());
-};
-d3_transitionPrototype.attr = function(name, value) {
-  return this.attrTween(name, d3_transitionTween(name, value));
-};
-
-d3_transitionPrototype.attrTween = function(nameNS, tween) {
-  var name = d3.ns.qualify(nameNS);
-
-  function attrTween(d, i) {
-    var f = tween.call(this, d, i, this.getAttribute(name));
-    return f === d3_transitionRemove
-        ? (this.removeAttribute(name), null)
-        : f && function(t) { this.setAttribute(name, f(t)); };
-  }
-
-  function attrTweenNS(d, i) {
-    var f = tween.call(this, d, i, this.getAttributeNS(name.space, name.local));
-    return f === d3_transitionRemove
-        ? (this.removeAttributeNS(name.space, name.local), null)
-        : f && function(t) { this.setAttributeNS(name.space, name.local, f(t)); };
-  }
-
-  return this.tween("attr." + nameNS, name.local ? attrTweenNS : attrTween);
-};
-d3_transitionPrototype.style = function(name, value, priority) {
-  if (arguments.length < 3) priority = "";
-  return this.styleTween(name, d3_transitionTween(name, value), priority);
-};
-
-d3_transitionPrototype.styleTween = function(name, tween, priority) {
-  if (arguments.length < 3) priority = "";
-  return this.tween("style." + name, function(d, i) {
-    var f = tween.call(this, d, i, window.getComputedStyle(this, null).getPropertyValue(name));
-    return f === d3_transitionRemove
-        ? (this.style.removeProperty(name), null)
-        : f && function(t) { this.style.setProperty(name, f(t), priority); };
-  });
-};
-d3_transitionPrototype.text = function(value) {
-  return this.tween("text", function(d, i) {
-    this.textContent = typeof value === "function"
-        ? value.call(this, d, i)
-        : value;
-  });
-};
-d3_transitionPrototype.remove = function() {
-  return this.each("end", function() {
-    var p;
-    if (!this.__transition__ && (p = this.parentNode)) p.removeChild(this);
-  });
-};
-d3_transitionPrototype.delay = function(value) {
-  var groups = this;
-  return groups.each(typeof value === "function"
-      ? function(d, i, j) { groups[j][i].delay = +value.apply(this, arguments); }
-      : (value = +value, function(d, i, j) { groups[j][i].delay = value; }));
-};
-d3_transitionPrototype.duration = function(value) {
-  var groups = this;
-  return groups.each(typeof value === "function"
-      ? function(d, i, j) { groups[j][i].duration = +value.apply(this, arguments); }
-      : (value = +value, function(d, i, j) { groups[j][i].duration = value; }));
-};
-function d3_transition_each(callback) {
-  for (var j = 0, m = this.length; j < m; j++) {
-    for (var group = this[j], i = 0, n = group.length; i < n; i++) {
-      var node = group[i];
-      if (node) callback.call(node = node.node, node.__data__, i, j);
-    }
-  }
-  return this;
-}
-d3_transitionPrototype.transition = function() {
-  return this.select(d3_this);
-};
-var d3_timer_queue = null,
-    d3_timer_interval, // is an interval (or frame) active?
-    d3_timer_timeout; // is a timeout active?
-
-// The timer will continue to fire until callback returns true.
-d3.timer = function(callback, delay, then) {
-  var found = false,
-      t0,
-      t1 = d3_timer_queue;
-
-  if (arguments.length < 3) {
-    if (arguments.length < 2) delay = 0;
-    else if (!isFinite(delay)) return;
-    then = Date.now();
-  }
-
-  // See if the callback's already in the queue.
-  while (t1) {
-    if (t1.callback === callback) {
-      t1.then = then;
-      t1.delay = delay;
-      found = true;
-      break;
-    }
-    t0 = t1;
-    t1 = t1.next;
-  }
-
-  // Otherwise, add the callback to the queue.
-  if (!found) d3_timer_queue = {
-    callback: callback,
-    then: then,
-    delay: delay,
-    next: d3_timer_queue
-  };
-
-  // Start animatin'!
-  if (!d3_timer_interval) {
-    d3_timer_timeout = clearTimeout(d3_timer_timeout);
-    d3_timer_interval = 1;
-    d3_timer_frame(d3_timer_step);
-  }
-}
-
-function d3_timer_step() {
-  var elapsed,
-      now = Date.now(),
-      t1 = d3_timer_queue;
-
-  while (t1) {
-    elapsed = now - t1.then;
-    if (elapsed >= t1.delay) t1.flush = t1.callback(elapsed);
-    t1 = t1.next;
-  }
-
-  var delay = d3_timer_flush() - now;
-  if (delay > 24) {
-    if (isFinite(delay)) {
-      clearTimeout(d3_timer_timeout);
-      d3_timer_timeout = setTimeout(d3_timer_step, delay);
-    }
-    d3_timer_interval = 0;
-  } else {
-    d3_timer_interval = 1;
-    d3_timer_frame(d3_timer_step);
-  }
-}
-
-d3.timer.flush = function() {
-  var elapsed,
-      now = Date.now(),
-      t1 = d3_timer_queue;
-
-  while (t1) {
-    elapsed = now - t1.then;
-    if (!t1.delay) t1.flush = t1.callback(elapsed);
-    t1 = t1.next;
-  }
-
-  d3_timer_flush();
-};
-
-// Flush after callbacks, to avoid concurrent queue modification.
-function d3_timer_flush() {
-  var t0 = null,
-      t1 = d3_timer_queue,
-      then = Infinity;
-  while (t1) {
-    if (t1.flush) {
-      t1 = t0 ? t0.next = t1.next : d3_timer_queue = t1.next;
-    } else {
-      then = Math.min(then, t1.then + t1.delay);
-      t1 = (t0 = t1).next;
-    }
-  }
-  return then;
-}
-
-var d3_timer_frame = window.requestAnimationFrame
-    || window.webkitRequestAnimationFrame
-    || window.mozRequestAnimationFrame
-    || window.oRequestAnimationFrame
-    || window.msRequestAnimationFrame
-    || function(callback) { setTimeout(callback, 17); };
-d3.transform = function(string) {
-  d3_transformG.setAttribute("transform", string);
-  var t = d3_transformG.transform.baseVal.consolidate();
-  return new d3_transform(t ? t.matrix : d3_transformIdentity);
-};
-
-// Compute x-scale and normalize the first row.
-// Compute shear and make second row orthogonal to first.
-// Compute y-scale and normalize the second row.
-// Finally, compute the rotation.
-function d3_transform(m) {
-  var r0 = [m.a, m.b],
-      r1 = [m.c, m.d],
-      kx = d3_transformNormalize(r0),
-      kz = d3_transformDot(r0, r1),
-      ky = d3_transformNormalize(d3_transformCombine(r1, r0, -kz)) || 0;
-  if (r0[0] * r1[1] < r1[0] * r0[1]) {
-    r0[0] *= -1;
-    r0[1] *= -1;
-    kx *= -1;
-    kz *= -1;
-  }
-  this.rotate = (kx ? Math.atan2(r0[1], r0[0]) : Math.atan2(-r1[0], r1[1])) * d3_transformDegrees;
-  this.translate = [m.e, m.f];
-  this.scale = [kx, ky];
-  this.skew = ky ? Math.atan2(kz, ky) * d3_transformDegrees : 0;
-};
-
-d3_transform.prototype.toString = function() {
-  return "translate(" + this.translate
-      + ")rotate(" + this.rotate
-      + ")skewX(" + this.skew
-      + ")scale(" + this.scale
-      + ")";
-};
-
-function d3_transformDot(a, b) {
-  return a[0] * b[0] + a[1] * b[1];
-}
-
-function d3_transformNormalize(a) {
-  var k = Math.sqrt(d3_transformDot(a, a));
-  if (k) {
-    a[0] /= k;
-    a[1] /= k;
-  }
-  return k;
-}
-
-function d3_transformCombine(a, b, k) {
-  a[0] += k * b[0];
-  a[1] += k * b[1];
-  return a;
-}
-
-var d3_transformG = document.createElementNS(d3.ns.prefix.svg, "g"),
-    d3_transformIdentity = {a: 1, b: 0, c: 0, d: 1, e: 0, f: 0},
-    d3_transformDegrees = 180 / Math.PI;
-function d3_noop() {}
-d3.scale = {};
-
-function d3_scaleExtent(domain) {
-  var start = domain[0], stop = domain[domain.length - 1];
-  return start < stop ? [start, stop] : [stop, start];
-}
-
-function d3_scaleRange(scale) {
-  return scale.rangeExtent ? scale.rangeExtent() : d3_scaleExtent(scale.range());
-}
-function d3_scale_nice(domain, nice) {
-  var i0 = 0,
-      i1 = domain.length - 1,
-      x0 = domain[i0],
-      x1 = domain[i1],
-      dx;
-
-  if (x1 < x0) {
-    dx = i0; i0 = i1; i1 = dx;
-    dx = x0; x0 = x1; x1 = dx;
-  }
-
-  if (dx = x1 - x0) {
-    nice = nice(dx);
-    domain[i0] = nice.floor(x0);
-    domain[i1] = nice.ceil(x1);
-  }
-
-  return domain;
-}
-
-function d3_scale_niceDefault() {
-  return Math;
-}
-d3.scale.linear = function() {
-  return d3_scale_linear([0, 1], [0, 1], d3.interpolate, false);
-};
-
-function d3_scale_linear(domain, range, interpolate, clamp) {
-  var output,
-      input;
-
-  function rescale() {
-    var linear = domain.length == 2 ? d3_scale_bilinear : d3_scale_polylinear,
-        uninterpolate = clamp ? d3_uninterpolateClamp : d3_uninterpolateNumber;
-    output = linear(domain, range, uninterpolate, interpolate);
-    input = linear(range, domain, uninterpolate, d3.interpolate);
-    return scale;
-  }
-
-  function scale(x) {
-    return output(x);
-  }
-
-  // Note: requires range is coercible to number!
-  scale.invert = function(y) {
-    return input(y);
-  };
-
-  scale.domain = function(x) {
-    if (!arguments.length) return domain;
-    domain = x.map(Number);
-    return rescale();
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    return rescale();
-  };
-
-  scale.rangeRound = function(x) {
-    return scale.range(x).interpolate(d3.interpolateRound);
-  };
-
-  scale.clamp = function(x) {
-    if (!arguments.length) return clamp;
-    clamp = x;
-    return rescale();
-  };
-
-  scale.interpolate = function(x) {
-    if (!arguments.length) return interpolate;
-    interpolate = x;
-    return rescale();
-  };
-
-  scale.ticks = function(m) {
-    return d3_scale_linearTicks(domain, m);
-  };
-
-  scale.tickFormat = function(m) {
-    return d3_scale_linearTickFormat(domain, m);
-  };
-
-  scale.nice = function() {
-    d3_scale_nice(domain, d3_scale_linearNice);
-    return rescale();
-  };
-
-  scale.copy = function() {
-    return d3_scale_linear(domain, range, interpolate, clamp);
-  };
-
-  return rescale();
-};
-
-function d3_scale_linearRebind(scale, linear) {
-  return d3.rebind(scale, linear, "range", "rangeRound", "interpolate", "clamp");
-}
-
-function d3_scale_linearNice(dx) {
-  dx = Math.pow(10, Math.round(Math.log(dx) / Math.LN10) - 1);
-  return {
-    floor: function(x) { return Math.floor(x / dx) * dx; },
-    ceil: function(x) { return Math.ceil(x / dx) * dx; }
-  };
-}
-
-// TODO Dates? Ugh.
-function d3_scale_linearTickRange(domain, m) {
-  var extent = d3_scaleExtent(domain),
-      span = extent[1] - extent[0],
-      step = Math.pow(10, Math.floor(Math.log(span / m) / Math.LN10)),
-      err = m / span * step;
-
-  // Filter ticks to get closer to the desired count.
-  if (err <= .15) step *= 10;
-  else if (err <= .35) step *= 5;
-  else if (err <= .75) step *= 2;
-
-  // Round start and stop values to step interval.
-  extent[0] = Math.ceil(extent[0] / step) * step;
-  extent[1] = Math.floor(extent[1] / step) * step + step * .5; // inclusive
-  extent[2] = step;
-  return extent;
-}
-
-function d3_scale_linearTicks(domain, m) {
-  return d3.range.apply(d3, d3_scale_linearTickRange(domain, m));
-}
-
-function d3_scale_linearTickFormat(domain, m) {
-  return d3.format(",." + Math.max(0, -Math.floor(Math.log(d3_scale_linearTickRange(domain, m)[2]) / Math.LN10 + .01)) + "f");
-}
-function d3_scale_bilinear(domain, range, uninterpolate, interpolate) {
-  var u = uninterpolate(domain[0], domain[1]),
-      i = interpolate(range[0], range[1]);
-  return function(x) {
-    return i(u(x));
-  };
-}
-function d3_scale_polylinear(domain, range, uninterpolate, interpolate) {
-  var u = [],
-      i = [],
-      j = 0,
-      n = domain.length;
-
-  while (++j < n) {
-    u.push(uninterpolate(domain[j - 1], domain[j]));
-    i.push(interpolate(range[j - 1], range[j]));
-  }
-
-  return function(x) {
-    var j = d3.bisect(domain, x, 1, domain.length - 1) - 1;
-    return i[j](u[j](x));
-  };
-}
-d3.scale.log = function() {
-  return d3_scale_log(d3.scale.linear(), d3_scale_logp);
-};
-
-function d3_scale_log(linear, log) {
-  var pow = log.pow;
-
-  function scale(x) {
-    return linear(log(x));
-  }
-
-  scale.invert = function(x) {
-    return pow(linear.invert(x));
-  };
-
-  scale.domain = function(x) {
-    if (!arguments.length) return linear.domain().map(pow);
-    log = x[0] < 0 ? d3_scale_logn : d3_scale_logp;
-    pow = log.pow;
-    linear.domain(x.map(log));
-    return scale;
-  };
-
-  scale.nice = function() {
-    linear.domain(d3_scale_nice(linear.domain(), d3_scale_niceDefault));
-    return scale;
-  };
-
-  scale.ticks = function() {
-    var extent = d3_scaleExtent(linear.domain()),
-        ticks = [];
-    if (extent.every(isFinite)) {
-      var i = Math.floor(extent[0]),
-          j = Math.ceil(extent[1]),
-          u = pow(extent[0]),
-          v = pow(extent[1]);
-      if (log === d3_scale_logn) {
-        ticks.push(pow(i));
-        for (; i++ < j;) for (var k = 9; k > 0; k--) ticks.push(pow(i) * k);
-      } else {
-        for (; i < j; i++) for (var k = 1; k < 10; k++) ticks.push(pow(i) * k);
-        ticks.push(pow(i));
-      }
-      for (i = 0; ticks[i] < u; i++) {} // strip small values
-      for (j = ticks.length; ticks[j - 1] > v; j--) {} // strip big values
-      ticks = ticks.slice(i, j);
-    }
-    return ticks;
-  };
-
-  scale.tickFormat = function(n, format) {
-    if (arguments.length < 2) format = d3_scale_logFormat;
-    if (arguments.length < 1) return format;
-    var k = n / scale.ticks().length,
-        f = log === d3_scale_logn ? (e = -1e-12, Math.floor) : (e = 1e-12, Math.ceil),
-        e;
-    return function(d) {
-      return d / pow(f(log(d) + e)) < k ? format(d) : "";
-    };
-  };
-
-  scale.copy = function() {
-    return d3_scale_log(linear.copy(), log);
-  };
-
-  return d3_scale_linearRebind(scale, linear);
-};
-
-var d3_scale_logFormat = d3.format(".0e");
-
-function d3_scale_logp(x) {
-  return Math.log(x) / Math.LN10;
-}
-
-function d3_scale_logn(x) {
-  return -Math.log(-x) / Math.LN10;
-}
-
-d3_scale_logp.pow = function(x) {
-  return Math.pow(10, x);
-};
-
-d3_scale_logn.pow = function(x) {
-  return -Math.pow(10, -x);
-};
-d3.scale.pow = function() {
-  return d3_scale_pow(d3.scale.linear(), 1);
-};
-
-function d3_scale_pow(linear, exponent) {
-  var powp = d3_scale_powPow(exponent),
-      powb = d3_scale_powPow(1 / exponent);
-
-  function scale(x) {
-    return linear(powp(x));
-  }
-
-  scale.invert = function(x) {
-    return powb(linear.invert(x));
-  };
-
-  scale.domain = function(x) {
-    if (!arguments.length) return linear.domain().map(powb);
-    linear.domain(x.map(powp));
-    return scale;
-  };
-
-  scale.ticks = function(m) {
-    return d3_scale_linearTicks(scale.domain(), m);
-  };
-
-  scale.tickFormat = function(m) {
-    return d3_scale_linearTickFormat(scale.domain(), m);
-  };
-
-  scale.nice = function() {
-    return scale.domain(d3_scale_nice(scale.domain(), d3_scale_linearNice));
-  };
-
-  scale.exponent = function(x) {
-    if (!arguments.length) return exponent;
-    var domain = scale.domain();
-    powp = d3_scale_powPow(exponent = x);
-    powb = d3_scale_powPow(1 / exponent);
-    return scale.domain(domain);
-  };
-
-  scale.copy = function() {
-    return d3_scale_pow(linear.copy(), exponent);
-  };
-
-  return d3_scale_linearRebind(scale, linear);
-};
-
-function d3_scale_powPow(e) {
-  return function(x) {
-    return x < 0 ? -Math.pow(-x, e) : Math.pow(x, e);
-  };
-}
-d3.scale.sqrt = function() {
-  return d3.scale.pow().exponent(.5);
-};
-d3.scale.ordinal = function() {
-  return d3_scale_ordinal([], {t: "range", x: []});
-};
-
-function d3_scale_ordinal(domain, ranger) {
-  var index,
-      range,
-      rangeBand;
-
-  function scale(x) {
-    return range[((index[x] || (index[x] = domain.push(x))) - 1) % range.length];
-  }
-
-  function steps(start, step) {
-    return d3.range(domain.length).map(function(i) { return start + step * i; });
-  }
-
-  scale.domain = function(x) {
-    if (!arguments.length) return domain;
-    domain = [];
-    index = {};
-    var i = -1, n = x.length, xi;
-    while (++i < n) if (!index[xi = x[i]]) index[xi] = domain.push(xi);
-    return scale[ranger.t](ranger.x, ranger.p);
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    rangeBand = 0;
-    ranger = {t: "range", x: x};
-    return scale;
-  };
-
-  scale.rangePoints = function(x, padding) {
-    if (arguments.length < 2) padding = 0;
-    var start = x[0],
-        stop = x[1],
-        step = (stop - start) / (domain.length - 1 + padding);
-    range = steps(domain.length < 2 ? (start + stop) / 2 : start + step * padding / 2, step);
-    rangeBand = 0;
-    ranger = {t: "rangePoints", x: x, p: padding};
-    return scale;
-  };
-
-  scale.rangeBands = function(x, padding) {
-    if (arguments.length < 2) padding = 0;
-    var start = x[0],
-        stop = x[1],
-        step = (stop - start) / (domain.length + padding);
-    range = steps(start + step * padding, step);
-    rangeBand = step * (1 - padding);
-    ranger = {t: "rangeBands", x: x, p: padding};
-    return scale;
-  };
-
-  scale.rangeRoundBands = function(x, padding) {
-    if (arguments.length < 2) padding = 0;
-    var start = x[0],
-        stop = x[1],
-        step = Math.floor((stop - start) / (domain.length + padding));
-    range = steps(start + Math.round((stop - start - (domain.length - padding) * step) / 2), step);
-    rangeBand = Math.round(step * (1 - padding));
-    ranger = {t: "rangeRoundBands", x: x, p: padding};
-    return scale;
-  };
-
-  scale.rangeBand = function() {
-    return rangeBand;
-  };
-
-  scale.rangeExtent = function() {
-    return ranger.x;
-  };
-
-  scale.copy = function() {
-    return d3_scale_ordinal(domain, ranger);
-  };
-
-  return scale.domain(domain);
-};
-/*
- * This product includes color specifications and designs developed by Cynthia
- * Brewer (http://colorbrewer.org/). See lib/colorbrewer for more information.
- */
-
-d3.scale.category10 = function() {
-  return d3.scale.ordinal().range(d3_category10);
-};
-
-d3.scale.category20 = function() {
-  return d3.scale.ordinal().range(d3_category20);
-};
-
-d3.scale.category20b = function() {
-  return d3.scale.ordinal().range(d3_category20b);
-};
-
-d3.scale.category20c = function() {
-  return d3.scale.ordinal().range(d3_category20c);
-};
-
-var d3_category10 = [
-  "#1f77b4", "#ff7f0e", "#2ca02c", "#d62728", "#9467bd",
-  "#8c564b", "#e377c2", "#7f7f7f", "#bcbd22", "#17becf"
-];
-
-var d3_category20 = [
-  "#1f77b4", "#aec7e8",
-  "#ff7f0e", "#ffbb78",
-  "#2ca02c", "#98df8a",
-  "#d62728", "#ff9896",
-  "#9467bd", "#c5b0d5",
-  "#8c564b", "#c49c94",
-  "#e377c2", "#f7b6d2",
-  "#7f7f7f", "#c7c7c7",
-  "#bcbd22", "#dbdb8d",
-  "#17becf", "#9edae5"
-];
-
-var d3_category20b = [
-  "#393b79", "#5254a3", "#6b6ecf", "#9c9ede",
-  "#637939", "#8ca252", "#b5cf6b", "#cedb9c",
-  "#8c6d31", "#bd9e39", "#e7ba52", "#e7cb94",
-  "#843c39", "#ad494a", "#d6616b", "#e7969c",
-  "#7b4173", "#a55194", "#ce6dbd", "#de9ed6"
-];
-
-var d3_category20c = [
-  "#3182bd", "#6baed6", "#9ecae1", "#c6dbef",
-  "#e6550d", "#fd8d3c", "#fdae6b", "#fdd0a2",
-  "#31a354", "#74c476", "#a1d99b", "#c7e9c0",
-  "#756bb1", "#9e9ac8", "#bcbddc", "#dadaeb",
-  "#636363", "#969696", "#bdbdbd", "#d9d9d9"
-];
-d3.scale.quantile = function() {
-  return d3_scale_quantile([], []);
-};
-
-function d3_scale_quantile(domain, range) {
-  var thresholds;
-
-  function rescale() {
-    var k = 0,
-        n = domain.length,
-        q = range.length;
-    thresholds = [];
-    while (++k < q) thresholds[k - 1] = d3.quantile(domain, k / q);
-    return scale;
-  }
-
-  function scale(x) {
-    if (isNaN(x = +x)) return NaN;
-    return range[d3.bisect(thresholds, x)];
-  }
-
-  scale.domain = function(x) {
-    if (!arguments.length) return domain;
-    domain = x.filter(function(d) { return !isNaN(d); }).sort(d3.ascending);
-    return rescale();
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    return rescale();
-  };
-
-  scale.quantiles = function() {
-    return thresholds;
-  };
-
-  scale.copy = function() {
-    return d3_scale_quantile(domain, range); // copy on write!
-  };
-
-  return rescale();
-};
-d3.scale.quantize = function() {
-  return d3_scale_quantize(0, 1, [0, 1]);
-};
-
-function d3_scale_quantize(x0, x1, range) {
-  var kx, i;
-
-  function scale(x) {
-    return range[Math.max(0, Math.min(i, Math.floor(kx * (x - x0))))];
-  }
-
-  function rescale() {
-    kx = range.length / (x1 - x0);
-    i = range.length - 1;
-    return scale;
-  }
-
-  scale.domain = function(x) {
-    if (!arguments.length) return [x0, x1];
-    x0 = +x[0];
-    x1 = +x[x.length - 1];
-    return rescale();
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    return rescale();
-  };
-
-  scale.copy = function() {
-    return d3_scale_quantize(x0, x1, range); // copy on write
-  };
-
-  return rescale();
-};
-d3.svg = {};
-d3.svg.arc = function() {
-  var innerRadius = d3_svg_arcInnerRadius,
-      outerRadius = d3_svg_arcOuterRadius,
-      startAngle = d3_svg_arcStartAngle,
-      endAngle = d3_svg_arcEndAngle;
-
-  function arc() {
-    var r0 = innerRadius.apply(this, arguments),
-        r1 = outerRadius.apply(this, arguments),
-        a0 = startAngle.apply(this, arguments) + d3_svg_arcOffset,
-        a1 = endAngle.apply(this, arguments) + d3_svg_arcOffset,
-        da = (a1 < a0 && (da = a0, a0 = a1, a1 = da), a1 - a0),
-        df = da < Math.PI ? "0" : "1",
-        c0 = Math.cos(a0),
-        s0 = Math.sin(a0),
-        c1 = Math.cos(a1),
-        s1 = Math.sin(a1);
-    return da >= d3_svg_arcMax
-      ? (r0
-      ? "M0," + r1
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + (-r1)
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + r1
-      + "M0," + r0
-      + "A" + r0 + "," + r0 + " 0 1,0 0," + (-r0)
-      + "A" + r0 + "," + r0 + " 0 1,0 0," + r0
-      + "Z"
-      : "M0," + r1
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + (-r1)
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + r1
-      + "Z")
-      : (r0
-      ? "M" + r1 * c0 + "," + r1 * s0
-      + "A" + r1 + "," + r1 + " 0 " + df + ",1 " + r1 * c1 + "," + r1 * s1
-      + "L" + r0 * c1 + "," + r0 * s1
-      + "A" + r0 + "," + r0 + " 0 " + df + ",0 " + r0 * c0 + "," + r0 * s0
-      + "Z"
-      : "M" + r1 * c0 + "," + r1 * s0
-      + "A" + r1 + "," + r1 + " 0 " + df + ",1 " + r1 * c1 + "," + r1 * s1
-      + "L0,0"
-      + "Z");
-  }
-
-  arc.innerRadius = function(v) {
-    if (!arguments.length) return innerRadius;
-    innerRadius = d3.functor(v);
-    return arc;
-  };
-
-  arc.outerRadius = function(v) {
-    if (!arguments.length) return outerRadius;
-    outerRadius = d3.functor(v);
-    return arc;
-  };
-
-  arc.startAngle = function(v) {
-    if (!arguments.length) return startAngle;
-    startAngle = d3.functor(v);
-    return arc;
-  };
-
-  arc.endAngle = function(v) {
-    if (!arguments.length) return endAngle;
-    endAngle = d3.functor(v);
-    return arc;
-  };
-
-  arc.centroid = function() {
-    var r = (innerRadius.apply(this, arguments)
-        + outerRadius.apply(this, arguments)) / 2,
-        a = (startAngle.apply(this, arguments)
-        + endAngle.apply(this, arguments)) / 2 + d3_svg_arcOffset;
-    return [Math.cos(a) * r, Math.sin(a) * r];
-  };
-
-  return arc;
-};
-
-var d3_svg_arcOffset = -Math.PI / 2,
-    d3_svg_arcMax = 2 * Math.PI - 1e-6;
-
-function d3_svg_arcInnerRadius(d) {
-  return d.innerRadius;
-}
-
-function d3_svg_arcOuterRadius(d) {
-  return d.outerRadius;
-}
-
-function d3_svg_arcStartAngle(d) {
-  return d.startAngle;
-}
-
-function d3_svg_arcEndAngle(d) {
-  return d.endAngle;
-}
-function d3_svg_line(projection) {
-  var x = d3_svg_lineX,
-      y = d3_svg_lineY,
-      interpolate = "linear",
-      interpolator = d3_svg_lineInterpolators[interpolate],
-      tension = .7;
-
-  function line(d) {
-    return d.length < 1 ? null : "M" + interpolator(projection(d3_svg_linePoints(this, d, x, y)), tension);
-  }
-
-  line.x = function(v) {
-    if (!arguments.length) return x;
-    x = v;
-    return line;
-  };
-
-  line.y = function(v) {
-    if (!arguments.length) return y;
-    y = v;
-    return line;
-  };
-
-  line.interpolate = function(v) {
-    if (!arguments.length) return interpolate;
-    interpolator = d3_svg_lineInterpolators[interpolate = v];
-    return line;
-  };
-
-  line.tension = function(v) {
-    if (!arguments.length) return tension;
-    tension = v;
-    return line;
-  };
-
-  return line;
-}
-
-d3.svg.line = function() {
-  return d3_svg_line(Object);
-};
-
-// Converts the specified array of data into an array of points
-// (x-y tuples), by evaluating the specified `x` and `y` functions on each
-// data point. The `this` context of the evaluated functions is the specified
-// "self" object; each function is passed the current datum and index.
-function d3_svg_linePoints(self, d, x, y) {
-  var points = [],
-      i = -1,
-      n = d.length,
-      fx = typeof x === "function",
-      fy = typeof y === "function",
-      value;
-  if (fx && fy) {
-    while (++i < n) points.push([
-      x.call(self, value = d[i], i),
-      y.call(self, value, i)
-    ]);
-  } else if (fx) {
-    while (++i < n) points.push([x.call(self, d[i], i), y]);
-  } else if (fy) {
-    while (++i < n) points.push([x, y.call(self, d[i], i)]);
-  } else {
-    while (++i < n) points.push([x, y]);
-  }
-  return points;
-}
-
-// The default `x` property, which references d[0].
-function d3_svg_lineX(d) {
-  return d[0];
-}
-
-// The default `y` property, which references d[1].
-function d3_svg_lineY(d) {
-  return d[1];
-}
-
-// The various interpolators supported by the `line` class.
-var d3_svg_lineInterpolators = {
-  "linear": d3_svg_lineLinear,
-  "step-before": d3_svg_lineStepBefore,
-  "step-after": d3_svg_lineStepAfter,
-  "basis": d3_svg_lineBasis,
-  "basis-open": d3_svg_lineBasisOpen,
-  "basis-closed": d3_svg_lineBasisClosed,
-  "bundle": d3_svg_lineBundle,
-  "cardinal": d3_svg_lineCardinal,
-  "cardinal-open": d3_svg_lineCardinalOpen,
-  "cardinal-closed": d3_svg_lineCardinalClosed,
-  "monotone": d3_svg_lineMonotone
-};
-
-// Linear interpolation; generates "L" commands.
-function d3_svg_lineLinear(points) {
-  var i = 0,
-      n = points.length,
-      p = points[0],
-      path = [p[0], ",", p[1]];
-  while (++i < n) path.push("L", (p = points[i])[0], ",", p[1]);
-  return path.join("");
-}
-
-// Step interpolation; generates "H" and "V" commands.
-function d3_svg_lineStepBefore(points) {
-  var i = 0,
-      n = points.length,
-      p = points[0],
-      path = [p[0], ",", p[1]];
-  while (++i < n) path.push("V", (p = points[i])[1], "H", p[0]);
-  return path.join("");
-}
-
-// Step interpolation; generates "H" and "V" commands.
-function d3_svg_lineStepAfter(points) {
-  var i = 0,
-      n = points.length,
-      p = points[0],
-      path = [p[0], ",", p[1]];
-  while (++i < n) path.push("H", (p = points[i])[0], "V", p[1]);
-  return path.join("");
-}
-
-// Open cardinal spline interpolation; generates "C" commands.
-function d3_svg_lineCardinalOpen(points, tension) {
-  return points.length < 4
-      ? d3_svg_lineLinear(points)
-      : points[1] + d3_svg_lineHermite(points.slice(1, points.length - 1),
-        d3_svg_lineCardinalTangents(points, tension));
-}
-
-// Closed cardinal spline interpolation; generates "C" commands.
-function d3_svg_lineCardinalClosed(points, tension) {
-  return points.length < 3
-      ? d3_svg_lineLinear(points)
-      : points[0] + d3_svg_lineHermite((points.push(points[0]), points),
-        d3_svg_lineCardinalTangents([points[points.length - 2]]
-        .concat(points, [points[1]]), tension));
-}
-
-// Cardinal spline interpolation; generates "C" commands.
-function d3_svg_lineCardinal(points, tension, closed) {
-  return points.length < 3
-      ? d3_svg_lineLinear(points)
-      : points[0] + d3_svg_lineHermite(points,
-        d3_svg_lineCardinalTangents(points, tension));
-}
-
-// Hermite spline construction; generates "C" commands.
-function d3_svg_lineHermite(points, tangents) {
-  if (tangents.length < 1
-      || (points.length != tangents.length
-      && points.length != tangents.length + 2)) {
-    return d3_svg_lineLinear(points);
-  }
-
-  var quad = points.length != tangents.length,
-      path = "",
-      p0 = points[0],
-      p = points[1],
-      t0 = tangents[0],
-      t = t0,
-      pi = 1;
-
-  if (quad) {
-    path += "Q" + (p[0] - t0[0] * 2 / 3) + "," + (p[1] - t0[1] * 2 / 3)
-        + "," + p[0] + "," + p[1];
-    p0 = points[1];
-    pi = 2;
-  }
-
-  if (tangents.length > 1) {
-    t = tangents[1];
-    p = points[pi];
-    pi++;
-    path += "C" + (p0[0] + t0[0]) + "," + (p0[1] + t0[1])
-        + "," + (p[0] - t[0]) + "," + (p[1] - t[1])
-        + "," + p[0] + "," + p[1];
-    for (var i = 2; i < tangents.length; i++, pi++) {
-      p = points[pi];
-      t = tangents[i];
-      path += "S" + (p[0] - t[0]) + "," + (p[1] - t[1])
-          + "," + p[0] + "," + p[1];
-    }
-  }
-
-  if (quad) {
-    var lp = points[pi];
-    path += "Q" + (p[0] + t[0] * 2 / 3) + "," + (p[1] + t[1] * 2 / 3)
-        + "," + lp[0] + "," + lp[1];
-  }
-
-  return path;
-}
-
-// Generates tangents for a cardinal spline.
-function d3_svg_lineCardinalTangents(points, tension) {
-  var tangents = [],
-      a = (1 - tension) / 2,
-      p0,
-      p1 = points[0],
-      p2 = points[1],
-      i = 1,
-      n = points.length;
-  while (++i < n) {
-    p0 = p1;
-    p1 = p2;
-    p2 = points[i];
-    tangents.push([a * (p2[0] - p0[0]), a * (p2[1] - p0[1])]);
-  }
-  return tangents;
-}
-
-// B-spline interpolation; generates "C" commands.
-function d3_svg_lineBasis(points) {
-  if (points.length < 3) return d3_svg_lineLinear(points);
-  var i = 1,
-      n = points.length,
-      pi = points[0],
-      x0 = pi[0],
-      y0 = pi[1],
-      px = [x0, x0, x0, (pi = points[1])[0]],
-      py = [y0, y0, y0, pi[1]],
-      path = [x0, ",", y0];
-  d3_svg_lineBasisBezier(path, px, py);
-  while (++i < n) {
-    pi = points[i];
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  i = -1;
-  while (++i < 2) {
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  return path.join("");
-}
-
-// Open B-spline interpolation; generates "C" commands.
-function d3_svg_lineBasisOpen(points) {
-  if (points.length < 4) return d3_svg_lineLinear(points);
-  var path = [],
-      i = -1,
-      n = points.length,
-      pi,
-      px = [0],
-      py = [0];
-  while (++i < 3) {
-    pi = points[i];
-    px.push(pi[0]);
-    py.push(pi[1]);
-  }
-  path.push(d3_svg_lineDot4(d3_svg_lineBasisBezier3, px)
-    + "," + d3_svg_lineDot4(d3_svg_lineBasisBezier3, py));
-  --i; while (++i < n) {
-    pi = points[i];
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  return path.join("");
-}
-
-// Closed B-spline interpolation; generates "C" commands.
-function d3_svg_lineBasisClosed(points) {
-  var path,
-      i = -1,
-      n = points.length,
-      m = n + 4,
-      pi,
-      px = [],
-      py = [];
-  while (++i < 4) {
-    pi = points[i % n];
-    px.push(pi[0]);
-    py.push(pi[1]);
-  }
-  path = [
-    d3_svg_lineDot4(d3_svg_lineBasisBezier3, px), ",",
-    d3_svg_lineDot4(d3_svg_lineBasisBezier3, py)
-  ];
-  --i; while (++i < m) {
-    pi = points[i % n];
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  return path.join("");
-}
-
-function d3_svg_lineBundle(points, tension) {
-  var n = points.length - 1,
-      x0 = points[0][0],
-      y0 = points[0][1],
-      dx = points[n][0] - x0,
-      dy = points[n][1] - y0,
-      i = -1,
-      p,
-      t;
-  while (++i <= n) {
-    p = points[i];
-    t = i / n;
-    p[0] = tension * p[0] + (1 - tension) * (x0 + t * dx);
-    p[1] = tension * p[1] + (1 - tension) * (y0 + t * dy);
-  }
-  return d3_svg_lineBasis(points);
-}
-
-// Returns the dot product of the given four-element vectors.
-function d3_svg_lineDot4(a, b) {
-  return a[0] * b[0] + a[1] * b[1] + a[2] * b[2] + a[3] * b[3];
-}
-
-// Matrix to transform basis (b-spline) control points to bezier
-// control points. Derived from FvD 11.2.8.
-var d3_svg_lineBasisBezier1 = [0, 2/3, 1/3, 0],
-    d3_svg_lineBasisBezier2 = [0, 1/3, 2/3, 0],
-    d3_svg_lineBasisBezier3 = [0, 1/6, 2/3, 1/6];
-
-// Pushes a "C" Bézier curve onto the specified path array, given the
-// two specified four-element arrays which define the control points.
-function d3_svg_lineBasisBezier(path, x, y) {
-  path.push(
-      "C", d3_svg_lineDot4(d3_svg_lineBasisBezier1, x),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier1, y),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier2, x),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier2, y),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier3, x),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier3, y));
-}
-
-// Computes the slope from points p0 to p1.
-function d3_svg_lineSlope(p0, p1) {
-  return (p1[1] - p0[1]) / (p1[0] - p0[0]);
-}
-
-// Compute three-point differences for the given points.
-// http://en.wikipedia.org/wiki/Cubic_Hermite_spline#Finite_difference
-function d3_svg_lineFiniteDifferences(points) {
-  var i = 0,
-      j = points.length - 1,
-      m = [],
-      p0 = points[0],
-      p1 = points[1],
-      d = m[0] = d3_svg_lineSlope(p0, p1);
-  while (++i < j) {
-    m[i] = d + (d = d3_svg_lineSlope(p0 = p1, p1 = points[i + 1]));
-  }
-  m[i] = d;
-  return m;
-}
-
-// Interpolates the given points using Fritsch-Carlson Monotone cubic Hermite
-// interpolation. Returns an array of tangent vectors. For details, see
-// http://en.wikipedia.org/wiki/Monotone_cubic_interpolation
-function d3_svg_lineMonotoneTangents(points) {
-  var tangents = [],
-      d,
-      a,
-      b,
-      s,
-      m = d3_svg_lineFiniteDifferences(points),
-      i = -1,
-      j = points.length - 1;
-
-  // The first two steps are done by computing finite-differences:
-  // 1. Compute the slopes of the secant lines between successive points.
-  // 2. Initialize the tangents at every point as the average of the secants.
-
-  // Then, for each segment…
-  while (++i < j) {
-    d = d3_svg_lineSlope(points[i], points[i + 1]);
-
-    // 3. If two successive yk = y{k + 1} are equal (i.e., d is zero), then set
-    // mk = m{k + 1} = 0 as the spline connecting these points must be flat to
-    // preserve monotonicity. Ignore step 4 and 5 for those k.
-
-    if (Math.abs(d) < 1e-6) {
-      m[i] = m[i + 1] = 0;
-    } else {
-      // 4. Let ak = mk / dk and bk = m{k + 1} / dk.
-      a = m[i] / d;
-      b = m[i + 1] / d;
-
-      // 5. Prevent overshoot and ensure monotonicity by restricting the
-      // magnitude of vector <ak, bk> to a circle of radius 3.
-      s = a * a + b * b;
-      if (s > 9) {
-        s = d * 3 / Math.sqrt(s);
-        m[i] = s * a;
-        m[i + 1] = s * b;
-      }
-    }
-  }
-
-  // Compute the normalized tangent vector from the slopes. Note that if x is
-  // not monotonic, it's possible that the slope will be infinite, so we protect
-  // against NaN by setting the coordinate to zero.
-  i = -1; while (++i <= j) {
-    s = (points[Math.min(j, i + 1)][0] - points[Math.max(0, i - 1)][0])
-      / (6 * (1 + m[i] * m[i]));
-    tangents.push([s || 0, m[i] * s || 0]);
-  }
-
-  return tangents;
-}
-
-function d3_svg_lineMonotone(points) {
-  return points.length < 3
-      ? d3_svg_lineLinear(points)
-      : points[0] +
-        d3_svg_lineHermite(points, d3_svg_lineMonotoneTangents(points));
-}
-d3.svg.line.radial = function() {
-  var line = d3_svg_line(d3_svg_lineRadial);
-  line.radius = line.x, delete line.x;
-  line.angle = line.y, delete line.y;
-  return line;
-};
-
-function d3_svg_lineRadial(points) {
-  var point,
-      i = -1,
-      n = points.length,
-      r,
-      a;
-  while (++i < n) {
-    point = points[i];
-    r = point[0];
-    a = point[1] + d3_svg_arcOffset;
-    point[0] = r * Math.cos(a);
-    point[1] = r * Math.sin(a);
-  }
-  return points;
-}
-function d3_svg_area(projection) {
-  var x0 = d3_svg_lineX,
-      x1 = d3_svg_lineX,
-      y0 = 0,
-      y1 = d3_svg_lineY,
-      interpolate,
-      i0,
-      i1,
-      tension = .7;
-
-  function area(d) {
-    if (d.length < 1) return null;
-    var points0 = d3_svg_linePoints(this, d, x0, y0),
-        points1 = d3_svg_linePoints(this, d, x0 === x1 ? d3_svg_areaX(points0) : x1, y0 === y1 ? d3_svg_areaY(points0) : y1);
-    return "M" + i0(projection(points1), tension)
-         + "L" + i1(projection(points0.reverse()), tension)
-         + "Z";
-  }
-
-  area.x = function(x) {
-    if (!arguments.length) return x1;
-    x0 = x1 = x;
-    return area;
-  };
-
-  area.x0 = function(x) {
-    if (!arguments.length) return x0;
-    x0 = x;
-    return area;
-  };
-
-  area.x1 = function(x) {
-    if (!arguments.length) return x1;
-    x1 = x;
-    return area;
-  };
-
-  area.y = function(y) {
-    if (!arguments.length) return y1;
-    y0 = y1 = y;
-    return area;
-  };
-
-  area.y0 = function(y) {
-    if (!arguments.length) return y0;
-    y0 = y;
-    return area;
-  };
-
-  area.y1 = function(y) {
-    if (!arguments.length) return y1;
-    y1 = y;
-    return area;
-  };
-
-  area.interpolate = function(x) {
-    if (!arguments.length) return interpolate;
-    i0 = d3_svg_lineInterpolators[interpolate = x];
-    i1 = i0.reverse || i0;
-    return area;
-  };
-
-  area.tension = function(x) {
-    if (!arguments.length) return tension;
-    tension = x;
-    return area;
-  };
-
-  return area.interpolate("linear");
-}
-
-d3_svg_lineStepBefore.reverse = d3_svg_lineStepAfter;
-d3_svg_lineStepAfter.reverse = d3_svg_lineStepBefore;
-
-d3.svg.area = function() {
-  return d3_svg_area(Object);
-};
-
-function d3_svg_areaX(points) {
-  return function(d, i) {
-    return points[i][0];
-  };
-}
-
-function d3_svg_areaY(points) {
-  return function(d, i) {
-    return points[i][1];
-  };
-}
-d3.svg.area.radial = function() {
-  var area = d3_svg_area(d3_svg_lineRadial);
-  area.radius = area.x, delete area.x;
-  area.innerRadius = area.x0, delete area.x0;
-  area.outerRadius = area.x1, delete area.x1;
-  area.angle = area.y, delete area.y;
-  area.startAngle = area.y0, delete area.y0;
-  area.endAngle = area.y1, delete area.y1;
-  return area;
-};
-d3.svg.chord = function() {
-  var source = d3_svg_chordSource,
-      target = d3_svg_chordTarget,
-      radius = d3_svg_chordRadius,
-      startAngle = d3_svg_arcStartAngle,
-      endAngle = d3_svg_arcEndAngle;
-
-  // TODO Allow control point to be customized.
-
-  function chord(d, i) {
-    var s = subgroup(this, source, d, i),
-        t = subgroup(this, target, d, i);
-    return "M" + s.p0
-      + arc(s.r, s.p1) + (equals(s, t)
-      ? curve(s.r, s.p1, s.r, s.p0)
-      : curve(s.r, s.p1, t.r, t.p0)
-      + arc(t.r, t.p1)
-      + curve(t.r, t.p1, s.r, s.p0))
-      + "Z";
-  }
-
-  function subgroup(self, f, d, i) {
-    var subgroup = f.call(self, d, i),
-        r = radius.call(self, subgroup, i),
-        a0 = startAngle.call(self, subgroup, i) + d3_svg_arcOffset,
-        a1 = endAngle.call(self, subgroup, i) + d3_svg_arcOffset;
-    return {
-      r: r,
-      a0: a0,
-      a1: a1,
-      p0: [r * Math.cos(a0), r * Math.sin(a0)],
-      p1: [r * Math.cos(a1), r * Math.sin(a1)]
-    };
-  }
-
-  function equals(a, b) {
-    return a.a0 == b.a0 && a.a1 == b.a1;
-  }
-
-  function arc(r, p) {
-    return "A" + r + "," + r + " 0 0,1 " + p;
-  }
-
-  function curve(r0, p0, r1, p1) {
-    return "Q 0,0 " + p1;
-  }
-
-  chord.radius = function(v) {
-    if (!arguments.length) return radius;
-    radius = d3.functor(v);
-    return chord;
-  };
-
-  chord.source = function(v) {
-    if (!arguments.length) return source;
-    source = d3.functor(v);
-    return chord;
-  };
-
-  chord.target = function(v) {
-    if (!arguments.length) return target;
-    target = d3.functor(v);
-    return chord;
-  };
-
-  chord.startAngle = function(v) {
-    if (!arguments.length) return startAngle;
-    startAngle = d3.functor(v);
-    return chord;
-  };
-
-  chord.endAngle = function(v) {
-    if (!arguments.length) return endAngle;
-    endAngle = d3.functor(v);
-    return chord;
-  };
-
-  return chord;
-};
-
-function d3_svg_chordSource(d) {
-  return d.source;
-}
-
-function d3_svg_chordTarget(d) {
-  return d.target;
-}
-
-function d3_svg_chordRadius(d) {
-  return d.radius;
-}
-
-function d3_svg_chordStartAngle(d) {
-  return d.startAngle;
-}
-
-function d3_svg_chordEndAngle(d) {
-  return d.endAngle;
-}
-d3.svg.diagonal = function() {
-  var source = d3_svg_chordSource,
-      target = d3_svg_chordTarget,
-      projection = d3_svg_diagonalProjection;
-
-  function diagonal(d, i) {
-    var p0 = source.call(this, d, i),
-        p3 = target.call(this, d, i),
-        m = (p0.y + p3.y) / 2,
-        p = [p0, {x: p0.x, y: m}, {x: p3.x, y: m}, p3];
-    p = p.map(projection);
-    return "M" + p[0] + "C" + p[1] + " " + p[2] + " " + p[3];
-  }
-
-  diagonal.source = function(x) {
-    if (!arguments.length) return source;
-    source = d3.functor(x);
-    return diagonal;
-  };
-
-  diagonal.target = function(x) {
-    if (!arguments.length) return target;
-    target = d3.functor(x);
-    return diagonal;
-  };
-
-  diagonal.projection = function(x) {
-    if (!arguments.length) return projection;
-    projection = x;
-    return diagonal;
-  };
-
-  return diagonal;
-};
-
-function d3_svg_diagonalProjection(d) {
-  return [d.x, d.y];
-}
-d3.svg.diagonal.radial = function() {
-  var diagonal = d3.svg.diagonal(),
-      projection = d3_svg_diagonalProjection,
-      projection_ = diagonal.projection;
-
-  diagonal.projection = function(x) {
-    return arguments.length
-        ? projection_(d3_svg_diagonalRadialProjection(projection = x))
-        : projection;
-  };
-
-  return diagonal;
-};
-
-function d3_svg_diagonalRadialProjection(projection) {
-  return function() {
-    var d = projection.apply(this, arguments),
-        r = d[0],
-        a = d[1] + d3_svg_arcOffset;
-    return [r * Math.cos(a), r * Math.sin(a)];
-  };
-}
-d3.svg.mouse = function(container) {
-  return d3_svg_mousePoint(container, d3.event);
-};
-
-// https://bugs.webkit.org/show_bug.cgi?id=44083
-var d3_mouse_bug44083 = /WebKit/.test(navigator.userAgent) ? -1 : 0;
-
-function d3_svg_mousePoint(container, e) {
-  var point = (container.ownerSVGElement || container).createSVGPoint();
-  if ((d3_mouse_bug44083 < 0) && (window.scrollX || window.scrollY)) {
-    var svg = d3.select(document.body)
-      .append("svg")
-        .style("position", "absolute")
-        .style("top", 0)
-        .style("left", 0);
-    var ctm = svg[0][0].getScreenCTM();
-    d3_mouse_bug44083 = !(ctm.f || ctm.e);
-    svg.remove();
-  }
-  if (d3_mouse_bug44083) {
-    point.x = e.pageX;
-    point.y = e.pageY;
-  } else {
-    point.x = e.clientX;
-    point.y = e.clientY;
-  }
-  point = point.matrixTransform(container.getScreenCTM().inverse());
-  return [point.x, point.y];
-};
-d3.svg.touches = function(container, touches) {
-  if (arguments.length < 2) touches = d3.event.touches;
-
-  return touches ? d3_array(touches).map(function(touch) {
-    var point = d3_svg_mousePoint(container, touch);
-    point.identifier = touch.identifier;
-    return point;
-  }) : [];
-};
-d3.svg.symbol = function() {
-  var type = d3_svg_symbolType,
-      size = d3_svg_symbolSize;
-
-  function symbol(d, i) {
-    return (d3_svg_symbols[type.call(this, d, i)]
-        || d3_svg_symbols.circle)
-        (size.call(this, d, i));
-  }
-
-  symbol.type = function(x) {
-    if (!arguments.length) return type;
-    type = d3.functor(x);
-    return symbol;
-  };
-
-  // size of symbol in square pixels
-  symbol.size = function(x) {
-    if (!arguments.length) return size;
-    size = d3.functor(x);
-    return symbol;
-  };
-
-  return symbol;
-};
-
-function d3_svg_symbolSize() {
-  return 64;
-}
-
-function d3_svg_symbolType() {
-  return "circle";
-}
-
-// TODO cross-diagonal?
-var d3_svg_symbols = {
-  "circle": function(size) {
-    var r = Math.sqrt(size / Math.PI);
-    return "M0," + r
-        + "A" + r + "," + r + " 0 1,1 0," + (-r)
-        + "A" + r + "," + r + " 0 1,1 0," + r
-        + "Z";
-  },
-  "cross": function(size) {
-    var r = Math.sqrt(size / 5) / 2;
-    return "M" + -3 * r + "," + -r
-        + "H" + -r
-        + "V" + -3 * r
-        + "H" + r
-        + "V" + -r
-        + "H" + 3 * r
-        + "V" + r
-        + "H" + r
-        + "V" + 3 * r
-        + "H" + -r
-        + "V" + r
-        + "H" + -3 * r
-        + "Z";
-  },
-  "diamond": function(size) {
-    var ry = Math.sqrt(size / (2 * d3_svg_symbolTan30)),
-        rx = ry * d3_svg_symbolTan30;
-    return "M0," + -ry
-        + "L" + rx + ",0"
-        + " 0," + ry
-        + " " + -rx + ",0"
-        + "Z";
-  },
-  "square": function(size) {
-    var r = Math.sqrt(size) / 2;
-    return "M" + -r + "," + -r
-        + "L" + r + "," + -r
-        + " " + r + "," + r
-        + " " + -r + "," + r
-        + "Z";
-  },
-  "triangle-down": function(size) {
-    var rx = Math.sqrt(size / d3_svg_symbolSqrt3),
-        ry = rx * d3_svg_symbolSqrt3 / 2;
-    return "M0," + ry
-        + "L" + rx +"," + -ry
-        + " " + -rx + "," + -ry
-        + "Z";
-  },
-  "triangle-up": function(size) {
-    var rx = Math.sqrt(size / d3_svg_symbolSqrt3),
-        ry = rx * d3_svg_symbolSqrt3 / 2;
-    return "M0," + -ry
-        + "L" + rx +"," + ry
-        + " " + -rx + "," + ry
-        + "Z";
-  }
-};
-
-d3.svg.symbolTypes = d3.keys(d3_svg_symbols);
-
-var d3_svg_symbolSqrt3 = Math.sqrt(3),
-    d3_svg_symbolTan30 = Math.tan(30 * Math.PI / 180);
-d3.svg.axis = function() {
-  var scale = d3.scale.linear(),
-      orient = "bottom",
-      tickMajorSize = 6,
-      tickMinorSize = 6,
-      tickEndSize = 6,
-      tickPadding = 3,
-      tickArguments_ = [10],
-      tickFormat_,
-      tickSubdivide = 0;
-
-  function axis(selection) {
-    selection.each(function(d, i, j) {
-      var g = d3.select(this);
-
-      // If selection is a transition, create subtransitions.
-      var transition = selection.delay ? function(o) {
-        var id = d3_transitionInheritId;
-        try {
-          d3_transitionInheritId = selection.id;
-          return o.transition()
-              .delay(selection[j][i].delay)
-              .duration(selection[j][i].duration)
-              .ease(selection.ease());
-        } finally {
-          d3_transitionInheritId = id;
-        }
-      } : Object;
-
-      // Ticks, or domain values for ordinal scales.
-      var ticks = scale.ticks ? scale.ticks.apply(scale, tickArguments_) : scale.domain(),
-          tickFormat = tickFormat_ == null ? (scale.tickFormat ? scale.tickFormat.apply(scale, tickArguments_) : String) : tickFormat_;
-
-      // Minor ticks.
-      var subticks = d3_svg_axisSubdivide(scale, ticks, tickSubdivide),
-          subtick = g.selectAll(".minor").data(subticks, String),
-          subtickEnter = subtick.enter().insert("line", "g").attr("class", "tick minor").style("opacity", 1e-6),
-          subtickExit = transition(subtick.exit()).style("opacity", 1e-6).remove(),
-          subtickUpdate = transition(subtick).style("opacity", 1);
-
-      // Major ticks.
-      var tick = g.selectAll("g").data(ticks, String),
-          tickEnter = tick.enter().insert("g", "path").style("opacity", 1e-6),
-          tickExit = transition(tick.exit()).style("opacity", 1e-6).remove(),
-          tickUpdate = transition(tick).style("opacity", 1),
-          tickTransform;
-
-      // Domain.
-      var range = d3_scaleRange(scale),
-          path = g.selectAll(".domain").data([0]),
-          pathEnter = path.enter().append("path").attr("class", "domain"),
-          pathUpdate = transition(path);
-
-      // Stash a snapshot of the new scale, and retrieve the old snapshot.
-      var scale1 = scale.copy(),
-          scale0 = this.__chart__ || scale1;
-      this.__chart__ = scale1;
-
-      tickEnter.append("line").attr("class", "tick");
-      tickEnter.append("text");
-      tickUpdate.select("text").text(tickFormat);
-
-      switch (orient) {
-        case "bottom": {
-          tickTransform = d3_svg_axisX;
-          subtickUpdate.attr("x2", 0).attr("y2", tickMinorSize);
-          tickUpdate.select("line").attr("x2", 0).attr("y2", tickMajorSize);
-          tickUpdate.select("text").attr("x", 0).attr("y", Math.max(tickMajorSize, 0) + tickPadding).attr("dy", ".71em").attr("text-anchor", "middle");
-          pathUpdate.attr("d", "M" + range[0] + "," + tickEndSize + "V0H" + range[1] + "V" + tickEndSize);
-          break;
-        }
-        case "top": {
-          tickTransform = d3_svg_axisX;
-          subtickUpdate.attr("x2", 0).attr("y2", -tickMinorSize);
-          tickUpdate.select("line").attr("x2", 0).attr("y2", -tickMajorSize);
-          tickUpdate.select("text").attr("x", 0).attr("y", -(Math.max(tickMajorSize, 0) + tickPadding)).attr("dy", "0em").attr("text-anchor", "middle");
-          pathUpdate.attr("d", "M" + range[0] + "," + -tickEndSize + "V0H" + range[1] + "V" + -tickEndSize);
-          break;
-        }
-        case "left": {
-          tickTransform = d3_svg_axisY;
-          subtickUpdate.attr("x2", -tickMinorSize).attr("y2", 0);
-          tickUpdate.select("line").attr("x2", -tickMajorSize).attr("y2", 0);
-          tickUpdate.select("text").attr("x", -(Math.max(tickMajorSize, 0) + tickPadding)).attr("y", 0).attr("dy", ".32em").attr("text-anchor", "end");
-          pathUpdate.attr("d", "M" + -tickEndSize + "," + range[0] + "H0V" + range[1] + "H" + -tickEndSize);
-          break;
-        }
-        case "right": {
-          tickTransform = d3_svg_axisY;
-          subtickUpdate.attr("x2", tickMinorSize).attr("y2", 0);
-          tickUpdate.select("line").attr("x2", tickMajorSize).attr("y2", 0);
-          tickUpdate.select("text").attr("x", Math.max(tickMajorSize, 0) + tickPadding).attr("y", 0).attr("dy", ".32em").attr("text-anchor", "start");
-          pathUpdate.attr("d", "M" + tickEndSize + "," + range[0] + "H0V" + range[1] + "H" + tickEndSize);
-          break;
-        }
-      }
-
-      // For quantitative scales:
-      // - enter new ticks from the old scale
-      // - exit old ticks to the new scale
-      if (scale.ticks) {
-        tickEnter.call(tickTransform, scale0);
-        tickUpdate.call(tickTransform, scale1);
-        tickExit.call(tickTransform, scale1);
-        subtickEnter.call(tickTransform, scale0);
-        subtickUpdate.call(tickTransform, scale1);
-        subtickExit.call(tickTransform, scale1);
-      }
-
-      // For ordinal scales:
-      // - any entering ticks are undefined in the old scale
-      // - any exiting ticks are undefined in the new scale
-      // Therefore, we only need to transition updating ticks.
-      else {
-        var dx = scale1.rangeBand() / 2, x = function(d) { return scale1(d) + dx; };
-        tickEnter.call(tickTransform, x);
-        tickUpdate.call(tickTransform, x);
-      }
-    });
-  }
-
-  axis.scale = function(x) {
-    if (!arguments.length) return scale;
-    scale = x;
-    return axis;
-  };
-
-  axis.orient = function(x) {
-    if (!arguments.length) return orient;
-    orient = x;
-    return axis;
-  };
-
-  axis.ticks = function() {
-    if (!arguments.length) return tickArguments_;
-    tickArguments_ = arguments;
-    return axis;
-  };
-
-  axis.tickFormat = function(x) {
-    if (!arguments.length) return tickFormat_;
-    tickFormat_ = x;
-    return axis;
-  };
-
-  axis.tickSize = function(x, y, z) {
-    if (!arguments.length) return tickMajorSize;
-    var n = arguments.length - 1;
-    tickMajorSize = +x;
-    tickMinorSize = n > 1 ? +y : tickMajorSize;
-    tickEndSize = n > 0 ? +arguments[n] : tickMajorSize;
-    return axis;
-  };
-
-  axis.tickPadding = function(x) {
-    if (!arguments.length) return tickPadding;
-    tickPadding = +x;
-    return axis;
-  };
-
-  axis.tickSubdivide = function(x) {
-    if (!arguments.length) return tickSubdivide;
-    tickSubdivide = +x;
-    return axis;
-  };
-
-  return axis;
-};
-
-function d3_svg_axisX(selection, x) {
-  selection.attr("transform", function(d) { return "translate(" + x(d) + ",0)"; });
-}
-
-function d3_svg_axisY(selection, y) {
-  selection.attr("transform", function(d) { return "translate(0," + y(d) + ")"; });
-}
-
-function d3_svg_axisSubdivide(scale, ticks, m) {
-  subticks = [];
-  if (m && ticks.length > 1) {
-    var extent = d3_scaleExtent(scale.domain()),
-        subticks,
-        i = -1,
-        n = ticks.length,
-        d = (ticks[1] - ticks[0]) / ++m,
-        j,
-        v;
-    while (++i < n) {
-      for (j = m; --j > 0;) {
-        if ((v = +ticks[i] - j * d) >= extent[0]) {
-          subticks.push(v);
-        }
-      }
-    }
-    for (--i, j = 0; ++j < m && (v = +ticks[i] + j * d) < extent[1];) {
-      subticks.push(v);
-    }
-  }
-  return subticks;
-}
-d3.svg.brush = function() {
-  var event = d3.dispatch("brushstart", "brush", "brushend"),
-      x, // x-scale, optional
-      y, // y-scale, optional
-      extent = [[0, 0], [0, 0]]; // [x0, y0], [x1, y1]
-
-  function brush(g) {
-    var resizes = x && y ? ["n", "e", "s", "w", "nw", "ne", "se", "sw"]
-        : x ? ["e", "w"]
-        : y ? ["n", "s"]
-        : [];
-
-    g.each(function() {
-      var g = d3.select(this).on("mousedown.brush", down),
-          bg = g.selectAll(".background").data([,]),
-          fg = g.selectAll(".extent").data([,]),
-          tz = g.selectAll(".resize").data(resizes, String),
-          e;
-
-      // An invisible, mouseable area for starting a new brush.
-      bg.enter().append("rect")
-          .attr("class", "background")
-          .style("visibility", "hidden")
-          .style("pointer-events", "all")
-          .style("cursor", "crosshair");
-
-      // The visible brush extent; style this as you like!
-      fg.enter().append("rect")
-          .attr("class", "extent")
-          .style("cursor", "move");
-
-      // More invisible rects for resizing the extent.
-      tz.enter().append("rect")
-          .attr("class", function(d) { return "resize " + d; })
-          .attr("width", 6)
-          .attr("height", 6)
-          .style("visibility", "hidden")
-          .style("pointer-events", brush.empty() ? "none" : "all")
-          .style("cursor", function(d) { return d3_svg_brushCursor[d]; });
-
-      // Remove any superfluous resizers.
-      tz.exit().remove();
-
-      // Initialize the background to fill the defined range.
-      // If the range isn't defined, you can post-process.
-      if (x) {
-        e = d3_scaleRange(x);
-        bg.attr("x", e[0]).attr("width", e[1] - e[0]);
-        d3_svg_brushRedrawX(g, extent);
-      }
-      if (y) {
-        e = d3_scaleRange(y);
-        bg.attr("y", e[0]).attr("height", e[1] - e[0]);
-        d3_svg_brushRedrawY(g, extent);
-      }
-    });
-  }
-
-  function down() {
-    var target = d3.select(d3.event.target);
-
-    // Store some global state for the duration of the brush gesture.
-    d3_svg_brush = brush;
-    d3_svg_brushTarget = this;
-    d3_svg_brushExtent = extent;
-    d3_svg_brushOffset = d3.svg.mouse(d3_svg_brushTarget);
-
-    // If the extent was clicked on, drag rather than brush;
-    // store the offset between the mouse and extent origin instead.
-    if (d3_svg_brushDrag = target.classed("extent")) {
-      d3_svg_brushOffset[0] = extent[0][0] - d3_svg_brushOffset[0];
-      d3_svg_brushOffset[1] = extent[0][1] - d3_svg_brushOffset[1];
-    }
-
-    // If a resizer was clicked on, record which side is to be resized.
-    // Also, set the offset to the opposite side.
-    else if (target.classed("resize")) {
-      d3_svg_brushResize = d3.event.target.__data__;
-      d3_svg_brushOffset[0] = extent[+/w$/.test(d3_svg_brushResize)][0];
-      d3_svg_brushOffset[1] = extent[+/^n/.test(d3_svg_brushResize)][1];
-    }
-
-    // If the ALT key is down when starting a brush, the center is at the mouse.
-    else if (d3.event.altKey) {
-      d3_svg_brushCenter = d3_svg_brushOffset.slice();
-    }
-
-    // Restrict which dimensions are resized.
-    d3_svg_brushX = !/^(n|s)$/.test(d3_svg_brushResize) && x;
-    d3_svg_brushY = !/^(e|w)$/.test(d3_svg_brushResize) && y;
-
-    // Notify listeners.
-    d3_svg_brushDispatch = dispatcher(this, arguments);
-    d3_svg_brushDispatch("brushstart");
-    d3_svg_brushMove();
-    d3_eventCancel();
-  }
-
-  function dispatcher(that, argumentz) {
-    return function(type) {
-      var e = d3.event;
-      try {
-        d3.event = {type: type, target: brush};
-        event[type].apply(that, argumentz);
-      } finally {
-        d3.event = e;
-      }
-    };
-  }
-
-  brush.x = function(z) {
-    if (!arguments.length) return x;
-    x = z;
-    return brush;
-  };
-
-  brush.y = function(z) {
-    if (!arguments.length) return y;
-    y = z;
-    return brush;
-  };
-
-  brush.extent = function(z) {
-    var x0, x1, y0, y1, t;
-
-    // Invert the pixel extent to data-space.
-    if (!arguments.length) {
-      if (x) {
-        x0 = extent[0][0], x1 = extent[1][0];
-        if (x.invert) x0 = x.invert(x0), x1 = x.invert(x1);
-        if (x1 < x0) t = x0, x0 = x1, x1 = t;
-      }
-      if (y) {
-        y0 = extent[0][1], y1 = extent[1][1];
-        if (y.invert) y0 = y.invert(y0), y1 = y.invert(y1);
-        if (y1 < y0) t = y0, y0 = y1, y1 = t;
-      }
-      return x && y ? [[x0, y0], [x1, y1]] : x ? [x0, x1] : y && [y0, y1];
-    }
-
-    // Scale the data-space extent to pixels.
-    if (x) {
-      x0 = z[0], x1 = z[1];
-      if (y) x0 = x0[0], x1 = x1[0];
-      if (x.invert) x0 = x(x0), x1 = x(x1);
-      if (x1 < x0) t = x0, x0 = x1, x1 = t;
-      extent[0][0] = x0, extent[1][0] = x1;
-    }
-    if (y) {
-      y0 = z[0], y1 = z[1];
-      if (x) y0 = y0[1], y1 = y1[1];
-      if (y.invert) y0 = y(y0), y1 = y(y1);
-      if (y1 < y0) t = y0, y0 = y1, y1 = t;
-      extent[0][1] = y0, extent[1][1] = y1;
-    }
-
-    return brush;
-  };
-
-  brush.clear = function() {
-    extent[0][0] =
-    extent[0][1] =
-    extent[1][0] =
-    extent[1][1] = 0;
-    return brush;
-  };
-
-  brush.empty = function() {
-    return (x && extent[0][0] === extent[1][0])
-        || (y && extent[0][1] === extent[1][1]);
-  };
-
-  d3.select(window)
-      .on("mousemove.brush", d3_svg_brushMove)
-      .on("mouseup.brush", d3_svg_brushUp)
-      .on("keydown.brush", d3_svg_brushKeydown)
-      .on("keyup.brush", d3_svg_brushKeyup);
-
-  return d3.rebind(brush, event, "on");
-};
-
-var d3_svg_brush,
-    d3_svg_brushDispatch,
-    d3_svg_brushTarget,
-    d3_svg_brushX,
-    d3_svg_brushY,
-    d3_svg_brushExtent,
-    d3_svg_brushDrag,
-    d3_svg_brushResize,
-    d3_svg_brushCenter,
-    d3_svg_brushOffset;
-
-function d3_svg_brushRedrawX(g, extent) {
-  g.select(".extent").attr("x", extent[0][0]);
-  g.selectAll(".n,.s,.w,.nw,.sw").attr("x", extent[0][0] - 2);
-  g.selectAll(".e,.ne,.se").attr("x", extent[1][0] - 3);
-  g.selectAll(".extent,.n,.s").attr("width", extent[1][0] - extent[0][0]);
-}
-
-function d3_svg_brushRedrawY(g, extent) {
-  g.select(".extent").attr("y", extent[0][1]);
-  g.selectAll(".n,.e,.w,.nw,.ne").attr("y", extent[0][1] - 3);
-  g.selectAll(".s,.se,.sw").attr("y", extent[1][1] - 4);
-  g.selectAll(".extent,.e,.w").attr("height", extent[1][1] - extent[0][1]);
-}
-
-function d3_svg_brushKeydown() {
-  if (d3.event.keyCode == 32 && d3_svg_brushTarget && !d3_svg_brushDrag) {
-    d3_svg_brushCenter = null;
-    d3_svg_brushOffset[0] -= d3_svg_brushExtent[1][0];
-    d3_svg_brushOffset[1] -= d3_svg_brushExtent[1][1];
-    d3_svg_brushDrag = 2;
-    d3_eventCancel();
-  }
-}
-
-function d3_svg_brushKeyup() {
-  if (d3.event.keyCode == 32 && d3_svg_brushDrag == 2) {
-    d3_svg_brushOffset[0] += d3_svg_brushExtent[1][0];
-    d3_svg_brushOffset[1] += d3_svg_brushExtent[1][1];
-    d3_svg_brushDrag = 0;
-    d3_eventCancel();
-  }
-}
-
-function d3_svg_brushMove() {
-  if (d3_svg_brushOffset) {
-    var mouse = d3.svg.mouse(d3_svg_brushTarget),
-        g = d3.select(d3_svg_brushTarget);
-
-    if (!d3_svg_brushDrag) {
-
-      // If needed, determine the center from the current extent.
-      if (d3.event.altKey) {
-        if (!d3_svg_brushCenter) {
-          d3_svg_brushCenter = [
-            (d3_svg_brushExtent[0][0] + d3_svg_brushExtent[1][0]) / 2,
-            (d3_svg_brushExtent[0][1] + d3_svg_brushExtent[1][1]) / 2
-          ];
-        }
-
-        // Update the offset, for when the ALT key is released.
-        d3_svg_brushOffset[0] = d3_svg_brushExtent[+(mouse[0] < d3_svg_brushCenter[0])][0];
-        d3_svg_brushOffset[1] = d3_svg_brushExtent[+(mouse[1] < d3_svg_brushCenter[1])][1];
-      }
-
-      // When the ALT key is released, we clear the center.
-      else d3_svg_brushCenter = null;
-    }
-
-    // Update the brush extent for each dimension.
-    if (d3_svg_brushX) {
-      d3_svg_brushMove1(mouse, d3_svg_brushX, 0);
-      d3_svg_brushRedrawX(g, d3_svg_brushExtent);
-    }
-    if (d3_svg_brushY) {
-      d3_svg_brushMove1(mouse, d3_svg_brushY, 1);
-      d3_svg_brushRedrawY(g, d3_svg_brushExtent);
-    }
-
-    // Notify listeners.
-    d3_svg_brushDispatch("brush");
-  }
-}
-
-function d3_svg_brushMove1(mouse, scale, i) {
-  var range = d3_scaleRange(scale),
-      r0 = range[0],
-      r1 = range[1],
-      offset = d3_svg_brushOffset[i],
-      size = d3_svg_brushExtent[1][i] - d3_svg_brushExtent[0][i],
-      min,
-      max;
-
-  // When dragging, reduce the range by the extent size and offset.
-  if (d3_svg_brushDrag) {
-    r0 -= offset;
-    r1 -= size + offset;
-  }
-
-  // Clamp the mouse so that the extent fits within the range extent.
-  min = Math.max(r0, Math.min(r1, mouse[i]));
-
-  // Compute the new extent bounds.
-  if (d3_svg_brushDrag) {
-    max = (min += offset) + size;
-  } else {
-
-    // If the ALT key is pressed, then preserve the center of the extent.
-    if (d3_svg_brushCenter) offset = Math.max(r0, Math.min(r1, 2 * d3_svg_brushCenter[i] - min));
-
-    // Compute the min and max of the offset and mouse.
-    if (offset < min) {
-      max = min;
-      min = offset;
-    } else {
-      max = offset;
-    }
-  }
-
-  // Update the stored bounds.
-  d3_svg_brushExtent[0][i] = min;
-  d3_svg_brushExtent[1][i] = max;
-}
-
-function d3_svg_brushUp() {
-  if (d3_svg_brushOffset) {
-    d3_svg_brushMove();
-    d3.select(d3_svg_brushTarget).selectAll(".resize").style("pointer-events", d3_svg_brush.empty() ? "none" : "all");
-    d3_svg_brushDispatch("brushend");
-    d3_svg_brush =
-    d3_svg_brushDispatch =
-    d3_svg_brushTarget =
-    d3_svg_brushX =
-    d3_svg_brushY =
-    d3_svg_brushExtent =
-    d3_svg_brushDrag =
-    d3_svg_brushResize =
-    d3_svg_brushCenter =
-    d3_svg_brushOffset = null;
-    d3_eventCancel();
-  }
-}
-
-var d3_svg_brushCursor = {
-  n: "ns-resize",
-  e: "ew-resize",
-  s: "ns-resize",
-  w: "ew-resize",
-  nw: "nwse-resize",
-  ne: "nesw-resize",
-  se: "nwse-resize",
-  sw: "nesw-resize"
-};
-d3.behavior = {};
-// TODO Track touch points by identifier.
-
-d3.behavior.drag = function() {
-  var event = d3.dispatch("drag", "dragstart", "dragend"),
-      origin = null;
-
-  function drag() {
-    this
-        .on("mousedown.drag", mousedown)
-        .on("touchstart.drag", mousedown);
-
-    d3.select(window)
-        .on("mousemove.drag", d3_behavior_dragMove)
-        .on("touchmove.drag", d3_behavior_dragMove)
-        .on("mouseup.drag", d3_behavior_dragUp, true)
-        .on("touchend.drag", d3_behavior_dragUp, true)
-        .on("click.drag", d3_behavior_dragClick, true);
-  }
-
-  // snapshot the local context for subsequent dispatch
-  function start() {
-    d3_behavior_dragEvent = event;
-    d3_behavior_dragEventTarget = d3.event.target;
-    d3_behavior_dragTarget = this;
-    d3_behavior_dragArguments = arguments;
-    d3_behavior_dragOrigin = d3_behavior_dragPoint();
-    if (origin) {
-      d3_behavior_dragOffset = origin.apply(d3_behavior_dragTarget, d3_behavior_dragArguments);
-      d3_behavior_dragOffset = [d3_behavior_dragOffset.x - d3_behavior_dragOrigin[0], d3_behavior_dragOffset.y - d3_behavior_dragOrigin[1]];
-    } else {
-      d3_behavior_dragOffset = [0, 0];
-    }
-    d3_behavior_dragMoved = 0;
-  }
-
-  function mousedown() {
-    start.apply(this, arguments);
-    d3_behavior_dragDispatch("dragstart");
-  }
-
-  drag.origin = function(x) {
-    if (!arguments.length) return origin;
-    origin = x;
-    return drag;
-  };
-
-  return d3.rebind(drag, event, "on");
-};
-
-var d3_behavior_dragEvent,
-    d3_behavior_dragEventTarget,
-    d3_behavior_dragTarget,
-    d3_behavior_dragArguments,
-    d3_behavior_dragOffset,
-    d3_behavior_dragOrigin,
-    d3_behavior_dragMoved;
-
-function d3_behavior_dragDispatch(type) {
-  var p = d3_behavior_dragPoint(),
-      o = d3.event,
-      e = d3.event = {type: type};
-
-  if (p) {
-    e.x = p[0] + d3_behavior_dragOffset[0];
-    e.y = p[1] + d3_behavior_dragOffset[1];
-    e.dx = p[0] - d3_behavior_dragOrigin[0];
-    e.dy = p[1] - d3_behavior_dragOrigin[1];
-    d3_behavior_dragMoved |= e.dx | e.dy;
-    d3_behavior_dragOrigin = p;
-  }
-
-  try {
-    d3_behavior_dragEvent[type].apply(d3_behavior_dragTarget, d3_behavior_dragArguments);
-  } finally {
-    d3.event = o;
-  }
-
-  o.stopPropagation();
-  o.preventDefault();
-}
-
-function d3_behavior_dragPoint() {
-  var p = d3_behavior_dragTarget.parentNode,
-      t = d3.event.changedTouches;
-  return p && (t
-      ? d3.svg.touches(p, t)[0]
-      : d3.svg.mouse(p));
-}
-
-function d3_behavior_dragMove() {
-  if (!d3_behavior_dragTarget) return;
-  var parent = d3_behavior_dragTarget.parentNode;
-
-  // O NOES! The drag element was removed from the DOM.
-  if (!parent) return d3_behavior_dragUp();
-
-  d3_behavior_dragDispatch("drag");
-  d3_eventCancel();
-}
-
-function d3_behavior_dragUp() {
-  if (!d3_behavior_dragTarget) return;
-  d3_behavior_dragDispatch("dragend");
-
-  // If the node was moved, prevent the mouseup from propagating.
-  // Also prevent the subsequent click from propagating (e.g., for anchors).
-  if (d3_behavior_dragMoved) {
-    d3_eventCancel();
-    d3_behavior_dragMoved = d3.event.target === d3_behavior_dragEventTarget;
-  }
-
-  d3_behavior_dragEvent =
-  d3_behavior_dragEventTarget =
-  d3_behavior_dragTarget =
-  d3_behavior_dragArguments =
-  d3_behavior_dragOffset =
-  d3_behavior_dragOrigin = null;
-}
-
-function d3_behavior_dragClick() {
-  if (d3_behavior_dragMoved) {
-    d3_eventCancel();
-    d3_behavior_dragMoved = 0;
-  }
-}
-// TODO unbind zoom behavior?
-d3.behavior.zoom = function() {
-  var xyz = [0, 0, 0],
-      event = d3.dispatch("zoom"),
-      extent = d3_behavior_zoomInfiniteExtent;
-
-  function zoom() {
-    this
-        .on("mousedown.zoom", mousedown)
-        .on("mousewheel.zoom", mousewheel)
-        .on("DOMMouseScroll.zoom", mousewheel)
-        .on("dblclick.zoom", dblclick)
-        .on("touchstart.zoom", touchstart);
-
-    d3.select(window)
-        .on("mousemove.zoom", d3_behavior_zoomMousemove)
-        .on("mouseup.zoom", d3_behavior_zoomMouseup)
-        .on("touchmove.zoom", d3_behavior_zoomTouchmove)
-        .on("touchend.zoom", d3_behavior_zoomTouchup)
-        .on("click.zoom", d3_behavior_zoomClick, true);
-  }
-
-  // snapshot the local context for subsequent dispatch
-  function start() {
-    d3_behavior_zoomXyz = xyz;
-    d3_behavior_zoomExtent = extent;
-    d3_behavior_zoomDispatch = event.zoom;
-    d3_behavior_zoomEventTarget = d3.event.target;
-    d3_behavior_zoomTarget = this;
-    d3_behavior_zoomArguments = arguments;
-  }
-
-  function mousedown() {
-    start.apply(this, arguments);
-    d3_behavior_zoomPanning = d3_behavior_zoomLocation(d3.svg.mouse(d3_behavior_zoomTarget));
-    d3_behavior_zoomMoved = 0;
-    d3.event.preventDefault();
-    window.focus();
-  }
-
-  // store starting mouse location
-  function mousewheel() {
-    start.apply(this, arguments);
-    if (!d3_behavior_zoomZooming) d3_behavior_zoomZooming = d3_behavior_zoomLocation(d3.svg.mouse(d3_behavior_zoomTarget));
-    d3_behavior_zoomTo(d3_behavior_zoomDelta() + xyz[2], d3.svg.mouse(d3_behavior_zoomTarget), d3_behavior_zoomZooming);
-  }
-
-  function dblclick() {
-    start.apply(this, arguments);
-    var mouse = d3.svg.mouse(d3_behavior_zoomTarget);
-    d3_behavior_zoomTo(d3.event.shiftKey ? Math.ceil(xyz[2] - 1) : Math.floor(xyz[2] + 1), mouse, d3_behavior_zoomLocation(mouse));
-  }
-
-  // doubletap detection
-  function touchstart() {
-    start.apply(this, arguments);
-    var touches = d3_behavior_zoomTouchup(),
-        touch,
-        now = Date.now();
-    if ((touches.length === 1) && (now - d3_behavior_zoomLast < 300)) {
-      d3_behavior_zoomTo(1 + Math.floor(xyz[2]), touch = touches[0], d3_behavior_zoomLocations[touch.identifier]);
-    }
-    d3_behavior_zoomLast = now;
-  }
-
-  zoom.extent = function(x) {
-    if (!arguments.length) return extent;
-    extent = x == null ? d3_behavior_zoomInfiniteExtent : x;
-    return zoom;
-  };
-
-  return d3.rebind(zoom, event, "on");
-};
-
-var d3_behavior_zoomDiv,
-    d3_behavior_zoomPanning,
-    d3_behavior_zoomZooming,
-    d3_behavior_zoomLocations = {}, // identifier -> location
-    d3_behavior_zoomLast = 0,
-    d3_behavior_zoomXyz,
-    d3_behavior_zoomExtent,
-    d3_behavior_zoomDispatch,
-    d3_behavior_zoomEventTarget,
-    d3_behavior_zoomTarget,
-    d3_behavior_zoomArguments,
-    d3_behavior_zoomMoved;
-
-function d3_behavior_zoomLocation(point) {
-  return [
-    point[0] - d3_behavior_zoomXyz[0],
-    point[1] - d3_behavior_zoomXyz[1],
-    d3_behavior_zoomXyz[2]
-  ];
-}
-
-// detect the pixels that would be scrolled by this wheel event
-function d3_behavior_zoomDelta() {
-
-  // mousewheel events are totally broken!
-  // https://bugs.webkit.org/show_bug.cgi?id=40441
-  // not only that, but Chrome and Safari differ in re. to acceleration!
-  if (!d3_behavior_zoomDiv) {
-    d3_behavior_zoomDiv = d3.select("body").append("div")
-        .style("visibility", "hidden")
-        .style("top", 0)
-        .style("height", 0)
-        .style("width", 0)
-        .style("overflow-y", "scroll")
-      .append("div")
-        .style("height", "2000px")
-      .node().parentNode;
-  }
-
-  var e = d3.event, delta;
-  try {
-    d3_behavior_zoomDiv.scrollTop = 1000;
-    d3_behavior_zoomDiv.dispatchEvent(e);
-    delta = 1000 - d3_behavior_zoomDiv.scrollTop;
-  } catch (error) {
-    delta = e.wheelDelta || (-e.detail * 5);
-  }
-
-  return delta * .005;
-}
-
-// Note: Since we don't rotate, it's possible for the touches to become
-// slightly detached from their original positions. Thus, we recompute the
-// touch points on touchend as well as touchstart!
-function d3_behavior_zoomTouchup() {
-  var touches = d3.svg.touches(d3_behavior_zoomTarget),
-      i = -1,
-      n = touches.length,
-      touch;
-  while (++i < n) d3_behavior_zoomLocations[(touch = touches[i]).identifier] = d3_behavior_zoomLocation(touch);
-  return touches;
-}
-
-function d3_behavior_zoomTouchmove() {
-  var touches = d3.svg.touches(d3_behavior_zoomTarget);
-  switch (touches.length) {
-
-    // single-touch pan
-    case 1: {
-      var touch = touches[0];
-      d3_behavior_zoomTo(d3_behavior_zoomXyz[2], touch, d3_behavior_zoomLocations[touch.identifier]);
-      break;
-    }
-
-    // double-touch pan + zoom
-    case 2: {
-      var p0 = touches[0],
-          p1 = touches[1],
-          p2 = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2],
-          l0 = d3_behavior_zoomLocations[p0.identifier],
-          l1 = d3_behavior_zoomLocations[p1.identifier],
-          l2 = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2, l0[2]];
-      d3_behavior_zoomTo(Math.log(d3.event.scale) / Math.LN2 + l0[2], p2, l2);
-      break;
-    }
-  }
-}
-
-function d3_behavior_zoomMousemove() {
-  d3_behavior_zoomZooming = null;
-  if (d3_behavior_zoomPanning) {
-    d3_behavior_zoomMoved = 1;
-    d3_behavior_zoomTo(d3_behavior_zoomXyz[2], d3.svg.mouse(d3_behavior_zoomTarget), d3_behavior_zoomPanning);
-  }
-}
-
-function d3_behavior_zoomMouseup() {
-  if (d3_behavior_zoomPanning) {
-    if (d3_behavior_zoomMoved) {
-      d3_eventCancel();
-      d3_behavior_zoomMoved = d3_behavior_zoomEventTarget === d3.event.target;
-    }
-
-    d3_behavior_zoomXyz =
-    d3_behavior_zoomExtent =
-    d3_behavior_zoomDispatch =
-    d3_behavior_zoomEventTarget =
-    d3_behavior_zoomTarget =
-    d3_behavior_zoomArguments =
-    d3_behavior_zoomPanning = null;
-  }
-}
-
-function d3_behavior_zoomClick() {
-  if (d3_behavior_zoomMoved) {
-    d3_eventCancel();
-    d3_behavior_zoomMoved = 0;
-  }
-}
-
-function d3_behavior_zoomTo(z, x0, x1) {
-  z = d3_behavior_zoomExtentClamp(z, 2);
-  var j = Math.pow(2, d3_behavior_zoomXyz[2]),
-      k = Math.pow(2, z),
-      K = Math.pow(2, (d3_behavior_zoomXyz[2] = z) - x1[2]),
-      x_ = d3_behavior_zoomXyz[0],
-      y_ = d3_behavior_zoomXyz[1],
-      x = d3_behavior_zoomXyz[0] = d3_behavior_zoomExtentClamp((x0[0] - x1[0] * K), 0, k),
-      y = d3_behavior_zoomXyz[1] = d3_behavior_zoomExtentClamp((x0[1] - x1[1] * K), 1, k),
-      o = d3.event; // Events can be reentrant (e.g., focus).
-
-  d3.event = {
-    scale: k,
-    translate: [x, y],
-    transform: function(sx, sy) {
-      if (sx) transform(sx, x_, x);
-      if (sy) transform(sy, y_, y);
-    }
-  };
-
-  function transform(scale, a, b) {
-    scale.domain(scale.range().map(function(v) { return scale.invert(((v - b) * j) / k + a); }));
-  }
-
-  try {
-    d3_behavior_zoomDispatch.apply(d3_behavior_zoomTarget, d3_behavior_zoomArguments);
-  } finally {
-    d3.event = o;
-  }
-
-  o.preventDefault();
-}
-
-var d3_behavior_zoomInfiniteExtent = [
-  [-Infinity, Infinity],
-  [-Infinity, Infinity],
-  [-Infinity, Infinity]
-];
-
-function d3_behavior_zoomExtentClamp(x, i, k) {
-  var range = d3_behavior_zoomExtent[i],
-      r0 = range[0],
-      r1 = range[1];
-  return arguments.length === 3
-      ? Math.max(r1 * (r1 === Infinity ? -Infinity : 1 / k - 1),
-        Math.min(r0 === -Infinity ? Infinity : r0, x / k)) * k
-      : Math.max(r0, Math.min(r1, x));
-}
-})();