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Signed DCA of all "good" tracks has a mean of ~1mm, sigma of ~3mm:

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signed DCA distribution for straight-up tracks (|eta| < 0.05) for vertex z constrained to +/-25cm.
error Image Added

Error on the mean = 0.01368
N = 2591,
RMS = 0.01368*sqrt(2591.) = 0.696 in agreement with the histogram

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Vertex finding performance (by Rosi)

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