http://geoanalytics.net/and/papers/ica01.pdf
An unclassed choropleth map uses shading rather than
numerical data on the map in its various areas of the map. Each area is given a
color or shade proportionate to its data. The darker the region, the more
intense on the scale of data than the lighter regions. This unclassed
choropleth map shows the birthrates in Europe through a varying and
proportional degree of darkness.
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