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Thanks for your detailed reply, Martin. I don't know StarTools but perhaps I will investigate!
According to Russ Croman he considers my setup to be borderline under sampled in 2 arc-sec seeing and the blocky looking small stars to be expected. He suggested enlarging the halo. This helps a bit but seems to defeat the purpose on larger stars where the tool seems to operate perfectly.
I may try making a mask only for the very tiny stars and see what happens.
Just how I make that mask may be the challenge as I'm pretty new to Pixinsight.
Peter
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