Thanks Alex and Shawn. Alex I just discovered that this image is not exactly natural. While trying some reprocessing of this image I noticed that the stars are in the wrong positions! I think I reorientated the starless image and forgot to reorientate the starmask. So when I recombined the two, the stars went into the wrong positions. I have corrected this and attached the correct image here. But I think I prefer the photo with the stars in the wrong positions! I'll think about this a bit more.
Rob
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