http://images.google.com/imgres?imgurl=http://www.math.yorku.ca/SCS/Gallery/images/dupin2.gif&imgrefurl=http://www.math.yorku.ca/SCS/Gallery/milestone/sec5.html&h=1270&w=1223&sz=427&hl=en&start=1&tbnid=2E6yc4WZO3TV0M:&tbnh=150&tbnw=144&prev=/images%3Fq%3Dunclassed%2Bchoropleth%2Bmap%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DNThe above map is an unclassed choropleth map of rates of illiteracy in France. An unclassed choropleth map is a map where color, gray scale, graduated colors indicate the level of the attributes displayed.
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