@span edumerco the original data structure is not that important, as you can reshape as needed programmatically. I just usually prefer the long over wide format for my raw data.
I found gnuplot (many years ago) to be limited for publication quality plots. The #RStats community is great and helpful, and I'd wager probably bigger than the elisp community. That said, the approach above is language agnostic. You should be able to feed the data table into elisp the same way.
@span schuemaa
You are totally right about the format. It is only that seeing things in a different perspective can open possibilities. :)
I am reading your comments about #gnuplot with care since I'm a but stuck with something simple as horizontal bars and it seems they are not supported...
