A unclassed choropleth map uses a continuous
grade change in color to represent a range of values. This map can be a great
number of color hues and thus can be easily misread.
The example map shows the birth rates for the state of Orgeon for 2001.
Reference URL: http://www.e-cartouche.ch/content_reg/cartouche/cartdesign/en/html/ThemMaps_ThemData.html
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