Much like the continuously variable proportional circle map, the range graded proportional circle map uses various sizes of circles to compare a variable in different geographic locations. The only difference between the two, however, is the basis of the circles on a set range of numbers instead of a specific value. This makes the map much more accurate in it's comparisons as it can be broken into equal quantiles (set of five ranges), breaks (arbitrary splits in the ranges), natural breaks (splits in ranges based upon natural frequency of data), and minimum variance (little change represented in ranges). The map shown here is a map of the aerial bombardment of Britain during World War II. The ranges are broken down and represented by circles sized to the value of the range. From the maps description, it's easy to see that the southern coast of England was heavily bombed in comparison to the north of England which was almost left untouched minus the few bombings that occurred to towards the north central of the country.
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