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I need your input

I have a tough problem that only appears with low noise images such as OIII.  

Individual calibrated frames look great.  
SBIG has  determined that the bias and darks from the camera are okay.

The cropped of the image is an integration of images. 
The artifact is barely noticeable in a stack of 30

 If you are willing  to take a crack at this, I can upload the images from my STX-16803.

Thanks

Max Mirot

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