Mark and Arnaud Betsy wanted to set the M2 OSEMs on the beamsplitter so we logged the open light voltages and calculated the gains and offsets. prettyOSEMgains(logOLs('H1','BSTST'),'BSTST') M2UL 25262 1.188 -12631 M2LL 24175 1.241 -12088 M2UR 24464 1.226 -12232 M2LR 20926 1.434 -10463