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I would like to visualize many proportions relative to their summation, where each proportion could be a positive or negative number. A perfect tool is the stacked area chart, example:

Stacked area chart

But this does not support negative values! Alternatively I found a hybrid line/stacked-histogram chart: Alternative?

However this has a major drawback: if the net summation is relatively low compared to the proportions, it will be almost invisible and adding a separate axis will introduce a lot of confusion.

Any suggestions on how best to visualize this?

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