D3 companion planting

Derived from the chord diagram example bundled with the d3.js library - https://github.com/mbostock/d3/wiki/Gallery

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<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <title>Companion Planting Chord Diagram</title>
    <script src="https://d3js.org/d3.v2.js"></script>
    <style>
    body {
      font: 11px sans-serif;
    }
​
    path.chord {
      fill-opacity: .3;
      stroke-opacity: .4;
    }
    </style>
  </head>
  <body>
    <script type="text/javascript" src="companionchord.js"></script>
  </body>
</html>
    

Modified http://d3js.org/d3.v2.js to a secure url

https://d3js.org/d3.v2.js