forked from tomshanley's block: Spiral heatmap
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forked from tomshanley's block: Spiral heatmap (with mouseover)
forked from tomshanley's block: Spiral heatmap #2 (with mouseover)
https://d3js.org/d3.v4.min.js
https://d3js.org/d3-scale-chromatic.v0.3.min.js