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Can't you use registax for stacking them?
I adjusted the curves and levels in PS to bring out a bit more detail, probably went a bit too far on it though.. when you process it yourself you might go a bit easier on the curves.. personal choice I suppose.
I also filtered it through NeatImage to reduce the noise.
Oh and there's a few compression artifacts because I processed an already reduced version.
Excellent shot of a great nebula!
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