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to the scaling methods for proportional symbol maps.

The most common method is to calculate the weight of a given line w in direct proportion to amount value v, based on an arbitrarily selected weight w₀ for a selected base value v₀ (often but not necessarily the minimum value):

This helps readers make intuitive judgements about relative value ratios based on relative weights; a line that is twice as thick as another represents twice the value. However, when

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