diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/core/zip.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/core/zip.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,13 @@
+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;
+}