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/usr/share/eccodes/definitions/mars/grib.mnth.ssd.def is in libeccodes-data 2.6.0-2.

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# assert(local=1)
meta verificationDate         g1verificationdate(dataDate, dataTime, endStep) : read_only;
meta monthlyVerificationDate  g1monthlydate(verificationDate) : dump,no_copy;
alias mars.date             = monthlyVerificationDate;

meta verificationYear          evaluate(verificationDate/10000);
meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
meta verificationMonth         evaluate( (verificationDate/100)%100 );
meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );

# class e4
# constant six = 6;
alias mars.step = startStep;

alias mars.instrument = instrumentType;
alias mars.ident = satelliteNumber;