spectrum-chart

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <link rel="stylesheet" href="spectrum-chart.css" />
</head>
​
<svg width="800" height="1200"></svg>
<script type="text/javascript" src="900byCountry.js"></script>
</body>
​
    

https://d3js.org/d3.v4.min.js