I've tested and it is present either if i use the only flats or only darks or none or both so it's not its problem. Have you got any ideas how to get rid of it?

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What stacking algorithm are you using and any pixel rejection? I found that Winsorized Sigma Clipping was giving me weird artifacts as well and once I switched to Generalized Extreme Studentized Deviate Test the artifacts went away! Good luck! |
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Oh… okay. I’ve used WSC so i’ll try the other one.
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