KSEC1 element	Contents	GRIB octet	Recommended GRIB_API keys	Coded GRIB_API keys	Comments
37	ECMWF local GRIB use definition identifier. 11 = Supplementary data used by the analysis.	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
-	Details of the analysis which used the supplementary data	-
42	Class of analysis	50	classOfAnalysis	classOfAnalysis
43	Type of analysis	51	typeOfAnalysis	typeOfAnalysis
44	Stream of analysis	52-53	streamOfAnalysis	streamOfAnalysis
45	Version number or experiment identifier of analysis. (4 ASCII characters, right justified)	54-57	experimentVersionNumberOfAnalysis	experimentVersionNumberOfAnalysis
46	Year of analysis (YY)	58	yearOfAnalysis	yearOfAnalysis
47	Month of analysis (MM)	59	monthOfAnalysis	monthOfAnalysis
48	Day of analysis (DD)	60	dayOfAnalysis	dayOfAnalysis
49	Hour of analysis (HH)	61	hourOfAnalysis	hourOfAnalysis
50	Minute of analysis (MM)	62	minuteOfAnalysis	minuteOfAnalysis
51	Century of analysis	63	centuryOfAnalysis	centuryOfAnalysis
52	Originating centre of analysis	64	originatingCentreOfAnalysis	originatingCentreOfAnalysis
53	Sub-centre of analysis	65	subcentreOfAnalysis	subcentreOfAnalysis
-	Spare (set to zero)	66-72