Figure 1 shows the time series data of laser power and PMC transmission power.
The left and right T cursors indicate times around 2 p.m. and 4 p.m., respectively, which likely correspond to the start and end times of work today.

Since we planned to characterize the laser with low power, the reduction in laser power during the activity is not unusual.
However, the laser power was reduced by 2 W just before finishing the activity, even though the power right before the reduction was almost the same as before the work.

I'm not sure what happened, but was this power reduction intentional?