I think this keystone is lifted up somewhat because temperature when the LVDT was installed is higher than today.

According to klog#3132, 3462, the LVDT of SF-GAS was calibrated in July 20 2017.

I plotted the temperature from this time.

Unfortunately, around this time, although temperature was not recorder because Ondotori had not been installed yet, the temperature might be around 24.5 degree.

On the other hand, temperature is 23.0 degree today.

So, temperature in PR2 are had been decreased by one degree since the installation.

Python script to draw the figure is in /kagra/Dropbox/Personal/Miyo/LOG/210128.