/usr/share/gmt/x2sys/mgd77.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 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | # $Id: mgd77.def 12822 2014-01-31 23:39:56Z remko $
#
# Define file for X2SYS processing of MGD77 files
#
#----------------------------------------------------------------------
#ASCII # The input file is ascii
#SKIP 24 # The number of header records to skip
#----------------------------------------------------------------------
#name intype NaN-proxy? NaN-proxy scale offset oformat
#----------------------------------------------------------------------
time a N 0 1 0 %10.0f
drt a N 0 1 0 %1.0f
tz a N 0 1 0 %3.0f
lat a N 0 1 0 %9.5f
lon a N 0 1 0 %10.5f
ptc a N 0 1 0 %1.0f
twt a N 0 1 0 %6.4f
depth a N 0 1 0 %6.0f
bcc a N 0 1 0 %2.0f
btc a N 0 1 0 %1.0f
mtf1 a N 0 1 0 %6.0f
mtf2 a N 0 1 0 %6.0f
mag a N 0 1 0 %6.0f
msens a N 0 1 0 %1.0f
diur a N 0 1 0 %5.0f
msd a N 0 1 0 %5.0f
gobs a N 0 1 0 %7.1f
eot a N 0 1 0 %6.1f
faa a N 0 1 0 %6.1f
nqc a N 0 1 0 %1.0f
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