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We have observed some shift in the time
zero over the course of the three week experimental run. The time shift
between the signal runs and background could cause some errors in
background subtraction. The uncertainty introduced by the few ns shift is
obviously negligible for the TOF measurements which has a time scale of
,
but its effect on the US yield was investigated by intentionally
introducing the time shift upon background subtraction, and found to be
about 0.5% for a shift of 4 ns, which can also be safely neglected.