Having the magnetometers closer to the mirror we can reveal some signals that were not well visible until now.

Moreover, there are structures in hrec (e.g. between 40 and 50Hz) that have a little but not trascurable coherence with these sensors.

A possible path could be that these magnetometers now can read the Zcorr signal sent to the mirror's coils, but their coherence with this last is near zero, so it seems the path is a real magnetic field directly acting on mirror's magnets.