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Thanks guys,
Mike you are right. Was not thinking when I did this last night. A star in our galaxy cannot illuminate dust outside it. Derr. I am not sure it is a gradient though. It is in an odd shape in the Blue and Lum frames and much more obvious when stretched right out. There is some faint light pollution towards that part of the sky eminating from Adelaide so that may be the source. Although in a search on the net there are a lot of images with that blue around the blue star and surrounds. In any event my original statement was completely wrong and thanks for pointing that out.
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