GridLeak measure of gap in residuals between padrows 12 and 14 vs. z shows about a ~1mm variation over all z:
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Signed DCA of straight up (|eta|<0.05) tracks vs. z shows about ~2mm distortions a Z beyond +/-50cm. *For Z restricted to +/-25 cm the distortions are ~0. 3mm *
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Signed DCA of all "good" tracks has a mean of ~1mm, sigma of ~3mm: Image Added
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signed DCA distribution for straight-up tracks (|eta| < 0.05) for vertex z constrained to +/-25cm. error on the mean = 0.01368 N = 2591, RMS = 0.01368*sqrt(2591.) = 0.696 in agreement with the histogram
