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The actual contents of the file can be viewed below.

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#		$Id: dat.def 12822 2014-01-31 23:39:56Z remko $
#
# Define file for X2SYS processing of mgd77 tools "DAT" format
#
#ASCII         # File is ASCII
#SKIP 24       # Skip 24 header records
#GEO           # Data are geographic
#name   type    NaN NaN-proxy   scale   offset  oformat
rec     a       N   0           1       0       -
TZ      a       N   0           1       0       -
year    a       N   0           1       0       -
month   a       N   0           1       0       -
day     a       N   0           1       0       -
hour    a       N   0           1       0       -
min     a       N   0           1       0       -
lat     a       N   0           1       0       -
lon     a       N   0           1       0       -
ptc     a       N   0           1       0       -
twt     a       N   0           1       0       -
depth   a       N   0           1       0       -
bcc     a       N   0           1       0       -
btc     a       N   0           1       0       -
mtf1    a       N   0           1       0       -
mtf2    a       N   0           1       0       -
mag     a       N   0           1       0       -
msens   a       N   0           1       0       -
diur    a       N   0           1       0       -
msd     a       N   0           1       0       -
gobs    a       N   0           1       0       -
eot     a       N   0           1       0       -
faa     a       N   0           1       0       -
nqc     a       N   0           1       0       -
id      a       N   0           1       0       -
sln     a       N   0           1       0       -
sspn    a       N   0           1       0       -