/usr/share/eccodes/definitions/mars/grib.mhwm.fcmax.def is in libeccodes-data 2.0.2-5.
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 | alias mars.number = perturbationNumber;
alias mars.origin = centre;
meta forecastperiod g1fcperiod(P1,P2,timeRangeIndicator,indicatorOfUnitOfTimeRange) : no_copy;
alias mars.fcperiod = forecastperiod;
unalias mars.step;
alias mars.refdate = referenceDate;
alias mars.method = methodNumber;
if (class is "od") { alias mars.system = systemNumber; }
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