/usr/share/eccodes/definitions/mars/grib.msdc.fc.def is in libeccodes-data 2.6.0-2.
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 | # assert(local=1)
# NOTE: verificationDate is based on startStep
meta verificationDate g1verificationdate(dataDate, dataTime, startStep) : read_only;
alias mars.date = verificationDate;
alias mars.step = startStep;
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