A proportional circle map uses circles to represent different ranges within the data. For the most part, these ranges are limited and can only be designated a certain size. As we can see this map in particular represents different ranges in Mexican population per state in the United States. The larger circle represents 6,000,000 Mexicans per state and the smallest circle represents 3,000.
http://cdepart.blogspot.com/2011/02/proportional-circle-map.html
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