Conclusions:
PMT 1800V
     Single photoelectron peaks result in ~1.2E-10Vs area +/- ~2.2E-11Vs.
PMT 1900V
     Single photoelectron peaks result in ~2.2E-10Vs area +/- ~2.3E-11Vs.
PMT 2000V
     Single photoelectron peaks result in ~8.5E-11Vs area +/- ~2.9E-11Vs.
SPE areas
PMT 1900V
spe01 -2.37E-10 Vs Area w/o peak -2.27453E-11 Vs
spe02 -2.54E-10 Vs
spe03 -2.22E-10 Vs
Average -2.15047E-10 Vs
PMT 2000V
spe04 -3.39E-10 Vs Area w/o peak
spe05 -617.1267E-12 Vs Run1 -46.9217E-12 Vs
spe06 -500.6038E-12 Vs Run2 -74.4667E-12 Vs
spe07 -265.5842E-12 Vs Run3 -8.62807E-11 Vs
Average -8.47E-11 Vs Average -2.87602E-11 Vs
PMT 1800V
Area w/o peak
spe08 -1.23E-10 Vs Run1 -2.16856E-11 Vs
spe09 -1.04E-10 Vs Run2 -2.26022E-11 Vs
spe10 -1.35E-10 Vs Run3 -2.16648E-11 Vs
Average -1.21E-10 Vs Average -2.19842E-11 Vs