Top: Bunch crossing (BC) ID of tracks obtained from the comparison of time of flight measured in the TOF detector and expected from the track kinematics. The ID is defined with respect to the BC in which the triggering interaction took place The peak at -15 corresponds to tracks not matched in TOF (mostly from the pileup in the TPC, outside of the TOF readout window of 500 ns). Bottom: $z$ coordinates of tracks' PCA to the beam axis in a single event with pileup; the positions of reconstructed vertices with attributed bunch crossings are shown by markers.