Local definition 191: Free format data descriptor data

Octets Key Type Contents
41 localDefinitionNumber unsigned ECMWF local GRIB use definition identifier. 191 = Free format data descriptor
42 class codetable Class = 121 (general member state data)
43 type codetable Type
44-45 stream codetable Stream
46-49 experimentVersionNumber ksec1expver Version number or experiment identifier. (4 ASCII characters, right justified)
50 Zero, for compatibility with Mars labelling
51 Zero, for compatibility with Mars labelling
52 formatVersionMajorNumber unsigned Format version major number
53 formatVersionMinorNumber unsigned Format version minor number
54 originalSubCentreIdentifier unsigned Original sub-centre identifier
55-58 Set to zero
59-60 numberOfBytesOfFreeFormatData unsigned Number of bytes of free format data descriptor (N, say)
61-(60+N) freeFormData unsigned Data descriptor bytes packed in integer array elements (J= the number of bytes in an integer = 4 or 8)
(61+N)-(60+80*M) The section is padded with zeroes to make the overall length of the section = 60 + 80*M for some M > 0