I have measured the arm visibilities.
I did not see any change since the last wiping. Our vacuum is not contaminating the cavity in the time scale of 2 months.
It is very good.
Arm visibility measurement ~ latest (Feb. 17, 2010)
X Arm: 0.898 +/- 0.003
Y Arm: 0.892 +/- 0.006
Arm visibility measurement after the vent (Dec. 14, 2009)
X Arm: 0.897 +/- 0.005
Y Arm: 0.893 +/- 0.004
Arm visibility measurement before the vent (Nov 10, 2009)
X Arm: 0.875 +/- 0.005
Y Arm: 0.869 +/- 0.006 |