retrieve,                       # Seasonal system 5, origin ECMWF
 class  = od,
 date   = 2018-10-01,
 expver = 1,
 levtype= sfc,
 method = 1,
 number = 0/to/50,
 origin = 98,
 param  = 167.128,
 step   = 12,
 stream = mmsf,
 system = 5,
 time   = 00:00:00,
 type   = fc,
 target = "output"