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Really nice shots. Without the benefit of a high resolution image my guess it's actually the blue colour of the brighter stars bleeding at their edges.. If you look at the brighter 'red' stars they have a red halo. If bet if you turn the brightness down in PS the centers would turn blue.
There are two stars about the same brightness to the right and below center obove one another and close., one has a red halo the other a blue.
Nice shots.
Bert
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