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WCSNAME

WCSTYPE

Comment

OPUS

‘distorted not aligned’

No distortion correction has been applied; analysis of these FLT/FLC files may only be performed if corrected by the instrument-specific pixel area map

IDC_0461802ej

‘undistorted not aligned'                                                                   

Distortion corrected using the IDCTAB reference file '0461802ej_idc.fits', but not aligned to an external catalog

IDC_0461802ej-GSC240

‘undistorted a priori solution based on GSC240'

Alignment based on Guide Star Catalog v2.4.0 (GSC240).  Absolute errors ~0.1"

IDC_0461802ej-HSC30

‘undistorted a priori solution based on HSC30’

Alignment based on Hubble Source Catalog v3.0.  HSC30 errors are typically smaller than GSC240. If both corrections are available, HSC takes precedence.

IDC_0461802ej-FIT_REL_GAIADR1

‘undistorted a posteriori solution relatively aligned to GAIADR1’

Exposures relatively aligned to one another, and subsequently aligned as a set to Gaia DR1

IDC_0461802ej-FIT_REL_GAIADR2

‘undistorted a posteriori solution relatively aligned to GAIADR2’

Exposures relatively aligned to one another, and subsequently aligned as a set to Gaia DR2 (including proper motion corrections to HST observation epoch)

IDC_0461802ej-FIT_REL_NONE

‘undistorted a posteriori solution relatively aligned to NONE’

Exposures relatively aligned to one another, but the quality of the fit to an absolute reference catalog is unverified and should be checked by the user

IDC_0461802ej-FIT_IMG_GAIADR1

‘undistorted a posteriori solution aligned image-by-image to GAIADR1’

Exposures individually aligned to Gaia DR1 (not as a set)

IDC_0461802ej-FIT_IMG_GAIADR2

‘undistorted a posteriori solution aligned image-by-image to GAIADR2’

Exposures individually aligned to Gaia DR2 (including proper motion corrections to the HST observation epoch)

IDC_0461802ej-FIT_IMG_NONE

‘undistorted a posteriori solution aligned image-by-image to NONE’

Exposures individually aligned to an astrometric reference catalog, but the quality of the fit is unverified and should be checked by the user

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