http://www.neiu.edu/~ejhowens/377/examples.htm
When dealing with a continuously variable proportional circle map the circles which represent the variables shown the circles will be presented in many different sizes. This is the case in the circle map which is presented above, the map shows the number of Mexicans which live in the western portion of the United States as of 1990. Just as with the other circle maps, the size of the circles represent the numbers of variables that were represented on the map, and not the size of the areas used in the study. The variables are represented with circles rather than dot. Also when using this type of circle maps the main point of interest is that of illustrating a variable with circles on a map.
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