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From: Michael Okuntsov <okuntsov.mikhail@yandex.ru>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Avoiding a color (yellow) in ploting data with lines
Date: Mon, 25 Apr 2016 04:22:52 +0600
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25.04.2016 03:10, bma.ova@gmail.com пишет:
> Hello,
>
> I'm plotting data from files: each files produces a colored curve.
> Gnuplot default behaviour makes each curve beeing colored with different color which is what I want.
>
> But as you may see in the following png file (even if my final result will be a pdf file), curve colored in yellow isn't well visible.
>
> http://wsdiscovery.free.fr/forumimgs/multiplot.png
>
> How can I avoid Gnuplot to use yellow color (#ffff00) for plotting curves?
>
> I didn't use any special palette and let Gnuplot do the job with "plot file1.dat with steps title "number", file2.dat with steps...
>
> Benji
>

You can define your own colors:
mycolors='0xFF0000 0x00FFFF 0x00FF00 0x0000FF'
plot [][-10:10] for [i=1:4] i w l lc rgbcolor word(mycolors,i)