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treebeard - on that 2nd one I had to really work hard to distinguish noise, and I think those lines may be from my efforts. I have since upgraded to the EOS6D, and its outstanding sensor, so I may go out and do this shot again the next time I have a chance when it is deep fog.
I had that happen to me once on a print, it had something to do with the way I exported the image to jpeg, but that was several years ago. It was easily visible when I had the image printed out.