/usr/share/gmt/cpt/cubhelix.cpt is in gmt-common 5.3.1+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Dave Green, Cambridge
# Designed for intensities
# From ch05m151010.cpt at cpt city
#----------------------------------------------------------
# COLOR_MODEL = RGB
#----------------------------------------------------------
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0.996078431373 253/254/253 1 white
#----------------------------------------------------------
B black
F white
N red
#----------------------------------------------------------
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