[Gate-users] Coincidences: XYZ position of the annihilation in world referential

[周凤银]

Dear everyone:
       I an simulating the PET machine by gate. When I see the
gateCoincidences.dat, I find that the XYZ position of the annihilation in
world referential in first single is different from the second single. I
think the XYZ position of the annihilation should be same. I do not know
why. I really hope there be someone can reply the question.
       Thank you very much！
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