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I used gnuplot to create a 3D surface from a data file "3D.txt" written in three columns x y z. I saw that the numbers on the color bar are ~40000 although the peak of my graph (z_max) is around 14 [see picture].

How can I solve this? I used simple code like:

gnuplot> set palette rgbformulae 22, 13, -31
gnuplot> splot "3D.txt"

enter image description here

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