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Peter, the resolution is great. So too is the star colour. I really like the overall look of the image.
There is indeed some noise in the background but you could simply collect more data rather than trying to process out the noise. Noise control really ought to be the last resort. A couple more hours would give you the noise control you would need.
There is also an odd looking mix of blue and black blobs in the back ground. However, both of those really are minor and I would only collect more data is you wanted to eliminate the visible noise altogether.
In my opinion a nice looking rendition of this globular.
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