Hi Ethan, thank you very much for all the explanations an the solutions. I will go with "set linetype 1 lc rgb c_1" etc (works for gnuplot v4, v5 and v6). FYI, my script dates back to 2019, on CentOS 7 with gnuplot version 4.x (https://ftp.fau.de/centos/7/os/x86_64/Packages/gnuplot-common-4.6.2-3.el7.x86_64.rpm) (I have serveral scripts to produce SVG images automatically. When switching from gnuplot 4.6 (CentOS 7) to gnuplot 5.2 (SLES 15) only minimal changes were necessary: this change and changing...
Attached: pie-chart-v6.svg - unexpected behavior in Version 6
Attached: pie-chart-v5.svg - unexpected behavior in Version 5
Attached: pie-chart-v4.svg - expected behavior in Version 4
colors ignored: plot ... with circles lc variable with SVG output
Attached sreenshot of pie-all-versions.png: version 4, 5, 6.