/usr/share/gmt/custom/meca.def 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.
1 2 3 4 5 6 7 8 9 10 11 12 | # $Id: meca.def 12822 2014-01-31 23:39:56Z remko $
#
# Definition file for meca symbol. Use in psxy
# as -Skmeca/size. Shows a focal mechanism beachball
# Color will be taken from commandline -G
#
0 0 1.0 c -G255
0 0 M
0 0.5 D
0 0 1.0 90 180 A
0.5 0 D
0 0 1.0 0 -90 A
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