Attached are plots of the cooling related signals from around the time of the laser trip on ~midday Sunday.
The minimum head flow rate was set to be 0.5 lpm as a precaution because the front end and power meter circuit
flow meters were disabled.

    From the XChilFlow_v_Head4 plot it looks like the flow rate in head 4 was down on its way beyond 0.5 lpm
and then the crystal chiller shutdown, as it was supposed.  The plots {In,Out}letPressure_v_Head4Flow show the
pressures in the water manifold at the same time.  The pressure oscillations occur as the chiller was shutting
down and not before it.

    XChil_v_H4, {In,Out}P_v_H4 are plots for the Sunday afternoon laser trip. Again consistent with the flow
rate in head 4 dipping below the trip threshold.