Difficulty with reidentify

Patrick Watson wrote on Feb 28, 2022

Hello from a lone IRAF user,

I have a spectrograph susceptible to flexure caused by temperature changes and gravity. The calibration lamp is internal to the spectrograph and hence any shift between calibration images can be sheeted home to the spectrograph. Calibration images are taken immediately prior to and following object images. Following preliminary processing objects are extracted via apall, comps via apsum.

I calibrating the prior 1D comp via identify then the following with reidentify. I know that if I set refit=no I can find a zeropoint shift in the database file which is something I watch. The points which I could die content knowing the answers to are: what does refit=yes actually do AND I suppose just as significantly what does not happen if refit=no?

Regards,

Patrick Watson.

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Last post on Feb 28, 2022