The HV of the HAPPEX detectors was changed during run 2507 in order to get signals in each detector of around 50k channels for data taking with 40 uA of beam. Det1 (left arm, slot 10, ch 9) = -1290 V Det2 (left arm, slot 10, ch 10) = -1280 V Det3 (right arm bottom, slot 10, ch 10) = -1195 V Det4 (right arm bottom, slot 10, ch 9) = -1485 V