Attached plot show trends of OSEM movements and subsequent watchdog activity.

Summary: we had three SWWD SEI trips (ETMY, ITMY, ITMX) followed by two SWWD SUS trips (ETMY, ITMY). We had one HWWD trip, ITMY.

Color code ETMY=BLUE, ITMY=RED, ITMX=GREEN, ETMX=GOLD.

Top panel: ETMY top stage 6 OSEMS

Second panel: ITMY top stage 6 OSEMS

Third panel: ITMX top stage 6 OSEMS

Fourth panel: ETMX top stage 6 OSEMS

Fifth panel: SWWD

Bottom panel: HWWD

Time Line (all times PDT Monday 8th September 2025)

(1) [21:11:44]: all four SWWD SEI timers start countdown

(2) [21:15:27]: ETMX goes good again (not shown, but ditto for ETMX HWWD)

(3) [21:16:42]: SWWD SEI trip, SEI IOP countdowns start, they trip in five minutes time

(4) [21:26:41]: ETMY SWWD SUS trip, its second timer is 10 minutes

(5) [21:31:54]: ITMY SWWD SUS trip, it has the original 15 minute timer, closely followed by:

(6) [21:32:29]: ITMY HWWD trip after its 20 minute countdown

(7) [21:38:14]: ITMY HWWD input goes good, ready for its reset button to be physically pushed

(8) [21:38:00]: ITMX SWWD SUS does not trip, it occasionally dips into the good region resetting the timer

(9) [21:42:00]: All SWWDs are reset, their inputs a good after the EQ has cleared