Range graded maps divide use a set number of circles,each circle having a range of values for it's size within the legend. The range graded map below shows the Filipino population in selected states in 2000.
http://2.bp.blogspot.com/-PGdP_GZ7x2Q/UW2WzveKQuI/AAAAAAAAALU/v_G0bYScXhM/s1600/proportional_circle.jpeg
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