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Hi Adriano,
You are correct when you say it is not shown in other images shown here and elsewhere.
Therefore it must some aberration introduced into the imaging sequence.
Maybe check each of the subs and see if it is present, that will eliminate any calibration or stacking error.
If it was a dirty mark on the optics or camera the same effect will be present on other images. Which means you will have to get some flat fields to eliminate it, assuming you can't see it on the optics and clean it off.
Sorry Adriano, you didn't discover something new.
Regards
Bill
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