The IMC alignment seems stable in a time scale of a week even with no WFSs activated.

The screen shot below is a trend of 6 days for the reflected and transmitted light of the IMC. There is no obvious power drop (or increment), indicating that the IMC alignment was stable.

It has been approximately 6 days since we disabled the WFSs alignment control for the IMC (see alog 7181). Note that the transmitted light became more stable when Rick activated the ISS in the last Thursday.