/usr/share/doc/gmt/examples/ex41/my_color.cpt is in gmt-examples 5.2.1+dfsg-3build1.
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 7 8 9 | 1 red
2 orange
3 yellow
4 green
5 bisque
6 cyan
7 magenta
8 white
9 gray
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