savePDF gives a perfect clone of the plot on screen while opened with Acrobat, Firefox, Brave; etc. but when sent
to a printer, the plot is "simplified" with straight lines or "blocks" (where the plot was very "noisy")
It is a plot with up to 5 graphs, log scale on the left, linear scale on the right.
The prints are different depending on the printers.
Where is the problem ? Any idea of how to fix this trouble ?
Thank you, J.