http://www.e-cartouche.ch/content_reg/cartouche/cartdesign/en/html/ThemMaps_ThemData.html
Range graded proportional circle maps use a set number of circles and have a range of values for each circle size within the legend. The data is divided into groups and each group is depicted by a specific symbol size.The map above measures the inhabitants of the Communes in Zurich, Switzerland.
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