The aperture X reference point in the science frame, retrieved from the SIAF entry "XSciRef" for the aperture in use. Gives the location of the target in floating-point image pixel values for NIRCam TSO grism exposures.
| Attribute | Value |
|---|---|
| data type | float |
| enumerated Values | not defined |
| units | pixels |
| example | 1581.0 |
| default value | |
| special processing | OPTIONAL |
| source | Science Data Processing (SDP) |
| software source | |
| calculation | |
| DB destination | ['ScienceCommonExt.xref_sci'] |
| data type in DB | float |
| instrument | NIRCAM |
| mode | NRC_TSGRISM |
| product level | 1b |
| FITS hdu | SCI |
| FITS header section | WCS Parameters |