The tiltmeter collected very nice data for several hours, even if it was running open loop and the excursion was larger than the sensor range. Then, at about 20:20 UTC, the signal disappeared (fig 1).

From 3 hours and half of free oscillation, applying an appropriate filtering, the evolution of the angular speed can be evaluated (fig 2). The time decay and the Q factor, equal to 270, has been obtained from an exponential fit. It seems quite high, for a resonance at 22 mHz. The mechanical losses are appreciably low.