Line plot in GnuPlot where line color is a third column in my data file?

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This following works for me (gnuplot 4.4)

plot "./file.dat" u 1:2:3 with lines  palette

Hope this helps.

When I ran your code gnuplot couldn’t pass the “rgb” part.

For an example of using the variable tag see the similar question:
GNUPLOT: dot plot with data depending dot size

with the useful examples found here:
http://gnuplot.sourceforge.net/demo/pointsize.html

All the best

Tom

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