I don’t know if this is still up-to-date, but a decade ago I used to use this tool in cases where I couldn’t access numbers behind published graphs: https://datathief.org/. - Source: Hacker News / over 1 year ago
Use https://datathief.org/ to convert this chart to a data table if you want to try it. Source: over 1 year ago
Use something like DataThief (https://datathief.org/) to get the waveform as data points. This depends on having a pretty clear picture of the waveform. Source: over 2 years ago
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