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I think you must be right, Rob. I could ascribe the graininess to just barely resolved foreground stars, which photographs show clearly. I'll have to set up that USNO B1.0 catalogue to really see how many stars approaching mag 15 would have been on the edge of perception for me at the time. Otherwise, I have no idea what it was I was seeing; artifact or actual? :-)
Cheers
Markus
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