The map displayed above is a range graded proportional circle map. Range graded proportional circle maps are used to represent a certain piece of data's population. The difference between range graded proportional circle maps and continuously variable proportional circle maps are range graded circle maps have set sizes for the circles. The only problem with using set sizes is it does not represent the actual population and instead of represents a range. Shown above is a range grade proportional circle on the population in certain states during the 16th century.
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