Well, I went back and checked the data where the flats would apply, and still the read noise is less than 1e.
Then I forgot to check 'CFA' in the PI basic ccd parameters script and that too reported 0.003 e for readout noise. So perhaps AIP4WIN cannot interpret OSC data.
Last edited by Martin Pugh; 07-02-2020 at 07:26 PM.
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