I tested the transmission of the green feedthrough SN6 we are planning to install in October, following the procedure on page 13-16 of S1800777

I measured 5.7mW out of the fiber laser, 3.8mW out of the first low insertion loss fiber, and 2.8mW out of the 5 meter low insertion loss fiber.  I measured 2.19mW of output power, so the transmission of the fiber was 78% in this test, compared to 86% reported in S1800777-v5.