/usr/share/gmt/cpt/GMT_copper.cpt is in gmt 4.5.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # $Id: GMT_copper.cpt,v 1.1 2001/09/23 23:11:20 pwessel Exp $
#
# Simulates the COPPER colormap in Matlab
# COLOR_MODEL = RGB
0.000000 0 0 0 0.796875 255 159 102
0.796875 255 159 102 1.000000 255 200 128
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