In our past study, shaking between 60-200Hz, there was a large amount of up-converted noise in the DARM.
https://klog.icrr.u-tokyo.ac.jp/osl/uploads/13881_20200329055034_35.png

So I suspect we can't use TF and coherence to evaluate this.

We can reduce environmental disturbances by turning off the FFUs, vacuum pumps, air coolers, etc.