In my lab, I want to maximize the coincidence rate, which varies with voltage as shown in the right graph, while minimizing statistical uncertainty from the raw count rate shown in the left graph. What is the method to determine what supply voltage will accomplish this?

10 5.29 5.50 5.75 6.00 6.23 6.50 Supply Voltage IV) Supply Voltage vi Figure 4: (Left) Example of the raw count rate for PMT 2 (blue circles) and PMT 3 (red crosses) as a function of the supply voltage. (Right ) Example of coincidence rate for PMT 1, 2, and 4 (blue circles) and PMT 1, 3, and 4 (red crosses) as function of the supply voltage for PMT 2 and 3