Number of groups in integration. Each integration within an exposure is required to have the same number of groups. The total number of groups in an exposure is determined by NGROUPS * NINTS. One exception to this is for instrument MIRI with readout pattern FASTGRPAVG, where the instrument flight settings are inconsistent with other modes. In this case NGROUPS per integration is calculated as NGROUPS = NGROUPS / NFRAMES, where NFRAMES=FRMDIVSR.
| Attribute | Value |
|---|---|
| data type | integer |
| enumerated Values | not defined |
| units | |
| example | 0 |
| default value | |
| special processing | VALUE_REQUIRED |
| source | Observatory Status File (OSF) |
| software source | |
| calculation | |
| DB destination | ['ScienceCommon.ngroups', 'GuideStar.ngroups'] |
| data type in DB | int |
| instrument | Multiple |
| mode | All |
| product level | 1a |
| FITS hdu | PRIMARY |
| FITS header section | Exposure |