Local definition 20: 4D variational increments

Octets Key Type Contents
41 localDefinitionNumber unsigned ECMWF local GRIB use definition identifier. 20 = 4D variational increments
42 class codetable Class
43 type codetable Type =33(4D variational increments)
44-45 stream codetable Stream
46-49 experimentVersionNumber ksec1expver Version number or experiment identifier. (4 ASCII characters, right justified)
50 iterationNumber unsigned Iteration
51 totalNumberOfIterations unsigned Total number of iterations
52 Spare (set to zero).