High Gain Counter versus Low Gain Counter

adc2 vs adc1 | adc4 vs adc3 | adc6 vs adc5 | adc8 vs adc7

Figure 1 : High gain counter versus low gain counter. It was decided early on to shoot for a ratio of 10:1. The high gain would then be able to see 1-particle events better than the low gain (for it, 1 particle is basically pedestal). The low gain would be able to see the large particle showers (when the high gain would be saturated).
We've pretty much decided that the curving of the data above (x, y) = (40, 400) is from the inefficiencies of the phototubes at high energies.