The violin mode damping code seems to be working well after some changes were made to it, as discussed in the LHO alog  (48239). The figure attached shows the ndscope of ETMX mode 9 (sample case) taken during IFO locking. The three plots are of Guardian states, monitor level (for etmx 9) and the GAIN. GUARDIAN is actively applying the GAIN whenever it's on DAMPING_ON_DC and shutting it off elsewhere.  The second plots shows the power spectrum of the 1st (fundamental) and 2nd harmonic for the violin modes. Red line represents the data taken on 26 March 2019 and the blue line is for the April 5 2019. The plot clearly shows that guardian is applying the GAIN and is successfully damping many of the modes.

Fundamental harmonics -  Earlier 8 modes where excited to the level around 10^-17 m/sqrtHz and above. Now, 5 out 7 modes have been damped to a level of 10^-18 or below.

2nd Harmonics - 3 peaks were seen around 10^-17 m/sqrtHz and above, out of which 2 have been damped down to 10^-18 m/sqrtHz and below.