Identifies the scaling factor between the data and the background reference file that was applied during the background subtraction step.
| Attribute | Value |
|---|---|
| data type | float |
| enumerated Values | not defined |
| units | |
| example | 1.03 |
| default value | |
| special processing | OPTIONAL |
| source | Calibration Software |
| software source | |
| calculation | sum(sci*bkg/var) / sum(bkg*bkg/var), with trace masking and iterative outlier rejection |
| DB destination | ['ScienceCommon.bkgd_scl'] |
| data type in DB | float |
| instrument | NIRCAM, NIRISS |
| mode | NRC_WFSS, NIS_WFSS |
| product level | 2b |
| FITS hdu | PRIMARY |
| FITS header section | Background information |