/usr/share/eccodes/definitions/mars/grib.ehmm.em.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 6 7 8 | #assert(local=31)
alias mars.fcmonth = forecastMonth;
unalias mars.step;
#unalias mars.total; #TODO: Check who sets it
alias mars.hdate = dataDate;
alias mars.date = referenceDate;
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