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They look pretty good to me too and I can't see much if any sign of noise .
I don't know much about your camera but I'm guessing it has much the same menu options as most DSLR's , have a look to see if it has long exposure noise reduction and if so turn it on and then close down the aperture a few f/stops which will increase the shutter time but with the tripod that won't matter ( lenses don't tend to work at their best wide open ), keep the ISO at the lowest standard level and try and get the exposure right in camera because as Dave has said PP work on recovering detail from shadows can produce noise .
Mark
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