source: http://www.d.umn.edu/geog/cartfolder/HTML%20Pages/Map-Types.htm
A range-graded scaling separates data into classes with varying symbol sizes that correspond to the individual classes. Map readers can quickly discern the relative differences in value based on the definite sizes of the symbols used. The map above shows population distribution of Africa (1990) in each African country. The largest dot represents 90,987+ people.
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