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Hi Greg,
I am using Poisson Sigma reject at 2%. That usually picks up everything that needs rejecting. I do data rejection prior to the combine.
Sometimes summed data still has some artefacts left over but if I up the rejection to 3% it will get rid of it.
When I create my flat frames I subtract the bias first and that works best for me. My flats are usually 30 subs.
Look under edit/settings/large stacks and then up the VM MB from base amount to whatever you want to use for memory settings.
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