KSEC1 element | Contents | GRIB octet | Recommended GRIB_API key | Coded GRIB_API keys | Comments
--- | --- | --- | --- | --- | ---
37 |
    ECMWF local GRIB use definition identifier.
    26 = MARS labeling or ensemble forecast data (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.
    Control forecast is number 0, perturbed forecasts ar-nne 1.
| 50 | number | number |
43 | Set to 0, if not an ensemble forecast. Otherwise, the total number of forecasts in an ensemble; the number includes the control forecast. | 51 | numberOfForecastsInEnsemble | numberOfForecastsInEnsemble |
44 | Reference date (YYYYMMDD) | 52-55 | referenceDate | referenceDate |
- | Spare (set to zero). | 56 |  |  |