KSEC1 element	Contents	GRIB octet	Recommended GRIB_API keys	Coded GRIB_API keys	Comments
37	ECMWF local GRIB use definition identifier. 22= coupled Atmospheric, Wave and Ocean models (with hindcast support))	41	localDefinitionNumber	localDefinitionNumber
38	Class	42	class	marsClass
39	Type	43	type	marsType
40	Stream	44-45	stream	marsStream
41	Version number or experiment identifier. (4 ASCII characters, right justified)	46-49	expver	experimentVersionNumber
42	Ensemble member number	50-51
43	Total number of ensembles.	52-53
44	System number (the "scientific version" number): 0 = RD experiment 1-65534 = operational version number 65535 = missing	54-55
45	Method number: distinguishes scientifically different forecast ensembles (eg different calibration/bias correction) 0 = control integration (ie without data assimilation) 1 - 65534 = operational version number	56-57
46	Reference date (YYYYMMDD)	58-61
47	Climate date - from (YYYYMMDD)	62-65
48	Climate date - to (YYYYMMDD)	66-69