The laser of the two PCal have been switched off on purpose at 16h UTC, to allow the activity of tomorrow morning on the PCal benches (modification of the cover of the NE injection bench to have less risk to touch the NCal when opening/closing the PCal bench ; tests of a cap design around the viewports to better stop scattered light between PCal benches and end towers). The plot shows the offsets of the four photodiode channels (few minutes after the stop).