[Nakano, Michimura]

X arm finesse was measured to be 1402 (ITMX 120 K, ETMX 118 K).
Only measured once due to laziness.

I modified the finesse fitting code to fit the data with

fitfunc = @(p,x) p(1).*exp(-(x-p(2))/p(3))+p(4)

instead of

fitfunc = @(p,x) p(1).*exp(-(x-p(2))/p(3))+trans(end)

to fit the offset also.
The code lives in /kagra/Dropbox/Personal/Commissioning/201905/ArmRingDownFit.m or  https://www.dropbox.com/s/56thgkorjrac32f/ArmRingDownFit.m?dl=0

I tried fitting past data and found that this will reduce the standard deviation by half.
The effect to the finesse itself is ~10 when the finesse is ~1400.

History of past finesse vs temperature measurements are also attached.