http://www.neiu.edu/~jrthomas/377/circle.jpg
Above is a Range Graded Proportional Circle Map, this map uses circles to represent numerical values that make it readily available and easy to decipher in differences attempting to be displayed.
By using an object such as circle with a proportional representation it is easy to see the difference in amounts. Above, this map is delivering the amount of Mexican people in the western United States in the year 1990, with such a useful map it is east to see that the top two populated areas where within Texas and California in that time period.
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