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Full user review
"Powerful, fully customisable plots."
1. You can get just the output you want, with a little effort.
2. The author is very helpful.
3. It does lots more (e.g. scripts), which I have not yet explored.
You have to download and install mysterious (to me) packages with names like Python and Numpy, which is a bit of a fiddle if you're not used to Terminal.
If you have been driven mad by trying to format the charts in spread-sheet packages, give Veusz a try - it's worth the effort.