The output of the 4 flow sensors - one per laser head - from the past 24 hours is attached.
The sensor for head 1 was replaced yesterday.  Not obvious to me why it did not settle down
as rapidly as the other 3 sensors.  But we will keep an eye on it.

The crystal chiller water level was lower this morning than what it was yesterday afternoon.
This might be due to the air bubbles working its way out of the plumbing.  We will continue
to monitor for leaks.