I added this cut to the "pair_ev" cut in the happex.cfg: definecut pair_evcut ((Entries$-Entry$)<900)&&(evt_bpm12mx[1]<60e3)&&(evt_bpm4amx[1]<60e3)&&(evt_bpm4 bmx[1]<60e3) This will effectively make "Empty Histograms" if the bpms are saturated. I'll make a note in the HOWTO page... and a small note near the DAQ computer.