Very nice Colin.
Interesting about the "blue" areas - I have a wide-field of the same area that I took at SPSP (which I will throw up when I get the chance) and it shows sections that I would probably describe as hazy or milky and are at quite a contrast to the very dark dust lanes and patches that can also be seen in your image. I'm thinking they're real and not a gradient. It's an area that doesn't seem to be imaged much at medium-wide focal lengths. There are quite a few images of the individual objects and plenty of really wide angle shots but not too many in between that I can find.
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