Help removing heavy artifacts...

[nyairman]

st-m31.jpg (364.58 KiB) Viewed 60 times

...this is from poor framing over multiple nights of imaging. I am looking for a way to remove the heavy artifacts seen in the top of this screen shot above M31. I have tried to remove it in post production but I am not happy with the result

Does anybody have a "fix" for removing this in Star Tools? Any help is greatly appreciated!

[admin]

I'm afraid that one is really difficult to remove. It looks like some sort of stacking artifact?

Do you know what caused it?