I checked the peak frequency from the violin mode. (Based on Tomaru-san measurement https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0115/E2011559/001/CRYsuspensionResonance%40O3.pdf)
I can find 180.62Hz peak, but I cannot find other peaks.
Here I show more detail (total 27 peaks):
173.026
174.034
176.508
177.926
178.299
178.388
178.539
179.050
179.248
179.758
179.833
180.053
180.094
180.255
180.625 (TMMX Fiber A)
180.898
180.962
181.624
181.662
182.092
182.147
182.543
182.960
183.425
184.027
184.315
184.385
each fiber can two spitted modes. Numbers of observed modes are less than 32.
And Q of modes looks on the order of 10^4 at least. It is fine.
Comment to Yokozawa-san,
Our resonant frequency measurement was done at room temperature at atomospheric pressure.
So, it isn't likely that frequencies of current violin modes are same as our measured values (several % difference is usual, in my opinion).
Comment to Yamamoto-san,
It is unlikely to the split of violin modes because we couldn't observe such split in our measurement.
So, I think many peaks are not from thermal noise of violin mode but other sources like vibration, acoustic, and so on.