Thank you Greg, Dennis, Marc and Mike for your thoughtful comments
I did a repro tonight using the sharpest of the set.
I also think 253 looks so much better with north at bottom too.
It seems to be a perspective thing for me, the dark dust lanes look
better this way.
This image survives the 'ten foot test' well too.
(turn the lights off and stand 10 ft from the screen)
Steve