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bundle alignments

I have question that I hope someone can answer for me. I’ve noticed (for example) that if I measure a part using several different stations that the positions of the features that I’ve measured in previous stations slightly change after each bundle alignment. Should I be using “keep oriented stations fixed” or “keep points and oriented stations fixed” in fit options so that I’m not adding more error to previously dimensioned features? Thanks

PCDMIS PORTABLE 2011 MR1