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Here's my flow in CCD Stack.
1_ calibrate (flats/darks/bias)
2_ reject bad pixel map. (interpolate rejected pixels)
3_ star registration
4_ Normalisation
5_ STD Sigma reject. I aim for top image 2% or explicitly from 1.9 when it's super noisy up to 2.5 maximum factor.
6_ bit of cropping then deconv if needed 30 iterations positive constraint
7_ Save as a scaled 16bit TIFF then off to PS.
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