Range graded proportional circle maps are maps that use size of circle to indicate quantity. What separates these maps from other proportional circle maps is that these show a range of circle sizes vs having a number of varying sizes correlating directly to quantity. These maps are great at showing the levels of comparison and allow the viewer ease in interpretation. The above map shows the number of airports per country in Europe from 2007. The map key shows that there are 5 ranges of circle sizes correlating to quantity of airports.
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