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d3.chart Choropleths

Choropleth charts built with the d3.chart framework. choropleth_chart.js is the chart type definition, which allows for rapid iteration of different quantize-scale domain/range, colors, and projections. The colors are based on color brewer, and you can pass any of the sequential scale abbreviations ('BuGn', 'PuBuGn', etc) to the range parameter to iterate on colors.