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Thanks Ken.
No rigor intended, more curiosity about when the noise becomes largely unobjectionable. Of course, that's subjective...
I have a few targets in the hit list that are fainter than the usual suspects I've been going for, so I've been looking for a yard stick really. The fainter targets will need more total exposure time to have acceptable noise levels when stretched, so it'd be useful to get a feel for what SNR/noise estimate I'm after.
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