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Bill: a median combine is good for rejecting outliers but doesn't give you optimal SNR. You would get a better result using an average combine and sigma clipping. The difference is significant. You lose about 20% SNR with a median combine.
Cheers,
Rick.[/QUOTE]
I wonder if that is true only for PI. In CCDstack I have done stacks using both and saw no real difference in the reported stats.
Greg.
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