/usr/share/gmt/cpt/GMT_gray.cpt is in gmt 4.5.11-1build1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 | # $Id: GMT_gray.cpt 9545 2011-07-27 19:31:54Z pwessel $
#
# Plain linear gray colormap
# COLOR_MODEL = RGB
0 0 0 0 1 255 255 255
|