Like Continuously Variable Proportional Circle Maps, Range Graded Proportional Circle Maps also demonstrate a given variable through the use of circles which are proportionally sized according to the quantity of the variable present at the location on the map. The difference is that Range Graded Proportional Circle Maps use a set number of circle sizes which correlate to a set range.
In this instance, each of the four circle sizes relates to a set quantity of zinc found in the Selwyn Basin, Yukon.
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