The plot in last entry only showed half the picture. Figure 1 is the complete one. Figure2 and 3 is the sieve patter of these two runs respectively. You can see from figure 3 that tg_phi is tilted due to the not symmetric left septum field. Hopefully correcting it back will remove the first order correlation of vz and tg_theta. (This is from original optics matrix, so even the one of 2725 with good septum is not lined up well yet.)
#2725
2725
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