/usr/share/eccodes/definitions/mars/grib.wmfm.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 11 | alias mars.number = perturbationNumber;
unalias mars.step;
# Old GRIBS do not have forecast forecastMonth set. It is computed from verifyingMonth
meta forecastPeriodFrom evaluate(verifyingMonth/1000) : no_copy;
meta forecastPeriodTo evaluate(verifyingMonth%1000) : no_copy;
meta forecastPeriod sprintf("%d-%d",forecastPeriodFrom,forecastPeriodTo) : dump;
alias mars.fcperiod = forecastPeriod;
alias mars.method = methodNumber;
if (class is "od") { alias mars.system = systemNumber; }
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