A range graded proportional circle map uses a specific number of specific-sized circles to show the data being measured. Unlike the continuously variable circle map, these maps have definite sized circles instead of using circles proportionally different circles. This particular map shows the amount of motor vehicle deaths in California using 5 different sized circles to represent the amount of deaths.
https://www.e-education.psu.edu/geog486/book/export/html/1796
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