The map shown here represents the amount of public bike docks to be built in NYC for a new public bike share program. Each of the 6 circle sizes represent a range of the number of docs to be installed in that location. Because each range of the variable is represented by its own circle size, the map can be classified as a range graded proportional circle map.
http://www.streetsblog.org/2012/05/15/mapping-how-nyc-bike-share-meshes-with-jobs-and-transit/
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