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Excel
(mander.xyz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.
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This is a science community. We use the Dawkins definition of meme.
Hmm. I just tested it in Excel. "No fill" will make it transparent. White would cover the grid lines.
So, I guess it's doable using a set of columns with identical colours. Calculating the values from a picture would also be possible - for a mad man.