[Yamada, Takahashi, Ushiba]

We finished installing the AR viewports on the IXC.
The torques are as follows:
5 Nm -> 10 Nm -> (one-day wait) -> 10 Nm

I put tapes near flanges, so you can find this information near flanges as well.
We have one more viewport for MN OpLev to install.
So, we will do it after closing the large flanges of IXC.