/usr/share/gmt/cpt/jet.cpt is in gmt-common 5.2.1+dfsg-3build1.
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1 2 3 4 5 6 7 8 9 | # $Id: jet.cpt 12822 2014-01-31 23:39:56Z remko $
#
# Simulates the JET colormap in Matlab
#
0.000 0/0/127 0.125 blue
0.125 blue 0.375 cyan
0.375 cyan 0.625 yellow
0.625 yellow 0.875 red
0.875 red 1.000 127/0/0
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