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From: John Edwards <johned0@gmail.com>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Varying colour of a line plot, using a palette
Date: Thu, 10 Nov 2016 11:03:44 +0000
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Dear all,
I was wondering if anyone can think of a neat trick to vary the color of 
a line according to magnitude. E.g. If I plot sin(x) I'd like the color 
to vary with signal matnitude.

To explain further what I am trying to do, I'd like to use a palette of 
greens and reds so that when the signal goes over a threshold then the 
plot would vary (slowly) from green to red to highlight specific issues.

Thanks very much, as always,
John