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Assuming that the reticles are "perfectly" square with each other,
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That really wasn't a part of the question. I only put that in there in order to get past some "Second-Guesser" Who might have added that he has seen reticles that were not square to each other. Guess it only added to some confusion. ...
Now then, back to the question;
Can we level or plumb to each and accept that we are level or in line with the pull of gravity? Isn't that what we are trying to achieve? ..... 
Be Safe !!!