The exact values for these are stored in:
/usr/local/etc/qlgui/pars.json<br />
"badMax0": 98, <br />
"badMin1": 2145, <br />
in python 0-based numbering.<br />
i.e. in python, to reproduce the same transformation, one would do:<br />
from astropy.io import fits<br />
im2D = fits.getdata('image.fits')<br />
im2D = im2D[:,-:] # flip x<br />
im2D = im2D[:,98:2145] # trim<br />
fits.writeto('outimage.fits',im2D)<br />
This image could then be used for a fresh extraction using IRAF or the user's preffered package, and will be one-to-one pixel aligned with the [approximate] WLC from the 1D extracted arc.
In IRAF, the equivalent would be:<br />
imcopy a0361665[-*,*] test.fits<br />
imcopy test.fits[99:2146,*] out65.fits</br />
[Note the 1-based indexing]