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If you’re imaging a dim galaxy under LP skies B6 to B9 then your stacked linear image is always going to be faint where you just see the bright core and very little detail in the spiral arms.
Did you stretch the image ?
With that amount of data even under LP skies you should see some detail above the noise floor when stretched, particularly with a big scope.
Was your scope focused correctly on a small star ?
I also concur with Richard , a calibrated data set will adjust the background to the correct brightness values.
Cheers
Martin
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