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xkcd #2864: Compact Graphs
(imgs.xkcd.com)
Alt text:
People may complain about readability, but even with jpeg compression, extracting the data points is usually computationally feasible if there aren't too many of them.
You are one of today's lucky 10.000!
https://www.explainxkcd.com/wiki/index.php/1053:_Ten_Thousand