I have attached some single strip energy vs time plots to show that the structure seen in the collective E vs t plots is in each strip. 

Attachments 1 and 2 show two different strips in S2-2 with no cuts. You can see that the 3 loci are different to one another in the single strips as well as in the combined S2-2 E vs t plot shown in attachment 3. Attachement 3 is plotted after applying the following cuts: equal energy in the front and back of each detector, low energy cut, must be a hit in each detector, multiplicity must be greater than 3. The 3 different loci are a beam pulse apart. The energy cal is 40keV/chan. 

Attachments 4 and 5 show energy vs time for single strips in S2-1 with no cuts. Attachment 6 shows the combined front strips in S2-1 after the same cuts as above for the combined S2-2 plot have been applied. Now there are 2 loci in the same beam pulse which are still there after the cuts. Not sure what the second line is. The energy cal in attachment 6 is 80keV/chan.