eccodes/definitions/mars/grib.msmm.em.def

# assert(16);
alias mars.fcmonth = marsForecastMonth;
unalias mars.step;

alias mars.origin = centre;
alias mars.method = methodNumber;

if (class is "od" || class is "me" || class is "en" || class is "c3") {
    alias mars.system = systemNumber;
}

# See ECC-624
if (centre == 80 && subCentre == 98 && (class is "c3" || class is "ci")) {
  constant cnmc_cmcc = 'cmcc';
  alias mars.origin = cnmc_cmcc;
}

if (class is "ci") { unalias mars.method; }