Identifies the NIRSpec grating wheel assembly element was used.
| Attribute | Value |
|---|---|
| data type | string |
| enumerated Values | ['G140M', 'G235M', 'G395M', 'G140H', 'G235H', 'G395H', 'PRISM', 'MIRROR', 'MULTIPLE', 'UNKNOWN', 'N/A', 'ANY'] |
| units | |
| example | G140M |
| default value | UNKNOWN |
| special processing | not defined |
| source | Observatory Status File (OSF) |
| software source | METRICS:nrsMechanism.grating |
| calculation | |
| DB destination | ['NirspecScience.grating'] |
| data type in DB | nvarchar(30) |
| instrument | NIRSPEC |
| mode | ['NRS_TASLIT', 'NRS_TACQ', 'NRS_TACONFIRM', 'NRS_CONFIRM', 'NRS_FIXEDSLIT', 'NRS_AUTOWAVECAL', 'NRS_IFU', 'NRS_MSASPEC', 'NRS_AUTOFLAT', 'NRS_IMAGE', 'NRS_FOCUS', 'NRS_DARK', 'NRS_LAMP', 'NRS_MIMF', 'NRS_BRIGHTOBJ'] |
| product level | 1b |
| FITS hdu | PRIMARY |
| FITS header section | Instrument |