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Value-by-alpha choropleth
http://bl.ocks.org/almccon/04b8859a5f8f259b82e2d3ecf73bca1f
See also: http://andywoodruff.com/blog/value-by-alpha-maps/
http://bl.ocks.org/almccon/04b8859a5f8f259b82e2d3ecf73bca1f
See also: http://andywoodruff.com/blog/value-by-alpha-maps/