| MAX_N_OVERLAP | int | QC: Maximum number of reference star pairs | |
| MAX_NREF | int | QC: Maximum number of reference star pairs | |
| MAX_RMS | float | QC: Maximum internal RMS of residuals | arcsec |
| MAX_RMS_OVERLAP | float | QC: Maximum internal RMS of overlap residuals | arcsec |
| MAX_SIGMA | float | QC: Maximum value of SIG_DRA or SIG_DDEC | arcsec |
| MAX_SIGMA_OVERLAP | float | QC: Maximum value of SIG_DRA or SIG_DDEC for overlaps | arcsec |
| MIN_N_OVERLAP | int | QC: Minimum number of overlap star pairs | |
| MIN_NREF | int | QC: Minimum number of reference star pairs | |
| REFCAT | str | Name of astrometric reference catalog (filename, URL, or SourceList.name) | |
| SOURCE_CODE_VERSION | int | The version of the source code | |
