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IRIS is free and does everything. It has a normalization command (I run it prior to stacking). Its gradient removal is amazing.
Trevor, not taking darks/flats at the same time (after/prior) to imaging is going to cause you to present sub-optimal results.
It all depends on how critical you want to be, I guess, but, I think your images could improve greatly if you did go the extra mile.
Cheers.
Regards,
Humayun
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