[Kimura and Nakagaki]
 We closed the gate valve called GVetmx between X-arm and EXA at 9:30.
 The vacuum pumping by TMP around the EXC was stopped in order to inject air into the EXC.
The pressure in the EXC at the time of the shutdown was ~10^-5 Pa.
 At 10:05, we started air injection to EYC up to atmospheric pressure.
Pressurization continued until about 16:00. The inner presusure of EXC was 2.8 x 10^4 Pa, when pressurization was stopeed.
To reach this pressure, we used three high-pressure gas cylinders filled with 7 m³ of air.
 The air injection operation is scheduled to resume on the morning of Sep. 11.
This may cause the temperature in the X-end chamber to change.
The injected air was G-2 grade pressurized air (klog25912) with a dew point of -80°C.