I selected the shoulder on the right arm that is more pronounced than the left and looked at the target angles. I basically get one spot on the right arm that looks like where the AT hole is (red points, see figures).
For these plots I've enforced:
upper quartz ADC > 580 (except for the black point scatter plot to show "everything") x+1.48m * th > -0.07 (elastic peak cut) N tracks == 1
The red points are with the additional cut in y. Not sure if these are events from the AT hole making it into the elastic peak or if it's events on the edge of the acceptance being very distorted.
Figure 1
Figure 2