D3 Examples - Sankey w circular links

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<!DOCTYPE html>
<html>
​
<head>
​
  
  <link href="https://fonts.googleapis.com/css?family=Roboto:100i" rel="stylesheet">
  <script src="d3-sankey-circular.js"></script>
  <script src="https://d3js.org/d3.v4.min.js"></script>
​
  <title>Sankey - slack question</title>
  <style>
    body {
      font-family: 'Roboto', sans-serif;
    }
​
    rect {
      shape-rendering: crispEdges;
    }
​
    text {
      font-size: 12px;
      font-family: monospace;
    }
​
    .link {
      fill: none;
    }
  </style>
</head>
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<body>
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  <h1>Sankey with circular links</h1>
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  <div id="chart"></div>
    <!--
  <script src="https://unpkg.com/d3-sankey-circular@0.28.0"></script>
    -->
  <script src="d3-path-arrows.js"></script>
  <script src="index.js"></script>
  
</body>
​
</html>
​
    