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I'm having trouble trying to add lines to an image plot. Here's an example illustrating the problem

plot 'xyz.dat' using image
set arrow 0,0 to 1,1 nohead
replot

Yet no lines appear. Is it even possible to add lines to an image plot?

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up vote 1 down vote accepted

You need to put the arrow in front of the image:

set arrow front from 0,0 to 1,1 nohead
plot 'xyz.dat' with image
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There should probably be set arrow from 0,0 to 1,1 nohead – pabouk Oct 9 '13 at 23:26

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