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Excellent first effort David. You've done well with the core. Most first timers over expose that region but you've kept it in check as well as being able to pick up some of the fainter stuff under bortle 8 skies. To answer your query regarding the white edges I'm not exactly sure if this is the cause but it reminds me of dreamer's haze (a.k.a light leaks) similar to what you'd get on film back in the day so maybe check around your camera/filter for any light leaks. Another thing to check is if your flats are calibrating correctly because if they're not then they too can introduce some unusual gradients. Good news is that it's fairly easy to correct so your data is fine. Congrats on the new camera.
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