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Actually I mostly work by eye and only get precision when I need to explain, Jim. Using the water bands to level it, your original needed 5 degrees of CCW rotation to level and, working Q & D by eye I gave it 5.5 degrees, over-correcting by half a degree - 10%.
If it's any consolation, when I set my horizons by eye and post, folks are happy to correct me for even half a degree of error. Fussy critiques. It's what we do.
Thanks, I am getting lots of help when I post images here. Sometimes being out of level seems natural to me. Just as sometimes I can't seem to get colors or saturation right. After looking at my Butte image a few days later, I can't help but wonder what was I thinking. At this point the image clearly looks serious out of level and I just could not see that before.