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Hi Markus,
Apart from minimising the effect of read noise there's no shortcut you can use to reduce time in the field. You're limited by shot noise and the only way to reduce the impact of that is to capture more data.
I'm not sure why you don't see larger numbers for binned pixels but as Ken said some normalisation must be going on.
Using sum or average (mean) gives you the same result in the end and there's no risk of overflow once you're dealing with floating point data in PixInsight (which normalises all values to the range 0..1 anyway.)
Cheers,
Rick.
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