"I hate stacked area charts" 

Example of a stacked area graph with annotations indicating what readers see vs. what is plotted.
Dr. Drang explains why stacked area graphs are potentially misleading.

This example illustrates why it’s important to think carefully about how data visualizations will be perceived by readers. Good writers do this automatically, but it seems more difficult with graphs.

Based on this, I consider stacked area graphs in the same category as pie charts: to be used only with great care.

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