Sorry, I don't have an answer for you either I'm afraid. Honestly I haven't used the template in many years. I just count from the center to the closest match, be it positive or negative. Usually you end up with an offset +-6 or so at most in my experience. I haven't really put more thought into it than that as I haven't had a reason to as it has never been a problem (I've printed plenty without doing any calibration as well for that matter).
As gr5 mentions, the PDF doesn't perfectly match up to the actual printed pattern, something that I've gotten a few calls about as well, so you can't use that to measure.
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gr5 2,224
I think perhaps @IRobertI knows the answer to your questions. I have also been annoyed by the example for the exact same reason. However in practice I think I've never gone beyond +/- 2. But I only have one UM3 and one S5 so maybe I got lucky.
I'm not sure how you got .15mm. Did you do this after doing the XY cal or by looking at the pdf file? I'm not sure if the two things match very well. I think it's much smaller than .15mm. More likely .05mm or .025mm? Someone told me once - but now I forget.
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