There are different types of range graded proportional maps, but circle maps are the most popular. They are the most important because they are easy to construct. From a symbol standpoint, a circle is the easiest to proportion. Also cirlces are a very good visual tool used that can be very stable from a graphing point.
http://go.owu.edu/~jbkrygie/krygier_html/geog_353/geog_353_lo/geog_353_lo11.html
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