KSEC1 element	Contents	GRIB octet	Recommended GRIB_API key	Coded GRIB_API keys	Comments
37	ECMWF local GRIB use definition identifier. 190 = Multiple ECMWF local definitions	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	Zero, for compatibility with Mars labelling	50
43	Zero, for compatibility with Mars labelling	51
44	Number of ECMWF local definitions (N, say)	52	numberOfLocalDefinitions	numberOfLocalDefinitions
45	First ECMWF local definition number	53	localDefNumberOne	localDefNumberOne
46	Number of bytes in first ECMWF local definition number	54-55	numberOfBytesInLocalDefinition	numberOfBytesInLocalDefinition
47	Second ECMWF local definition number	56
48	Number of bytes in second ECMWF local definition number	57-58
...	...
43+N*2	Stream of ECMWF local definition bytes previously encode/decoded via function calls	53+N*3