Figure S1. 10 min averaged gravity time series from the AQG-B at PDN and corrections for perturbing effects. All time series are in nm/s2. A: Raw gravity signal. B-G: Corrections applied to the data, to reduce the effects of: earth tides (B), polar motion (C), atmospheric pressure (D), ground tilt (E), drift of the RF frequency reference (F), drift of the laser frequency (G). Correction for the latter effect is applied during the measurement, through a feedback loop, rather than in post-processing, as in the case of the other perturbing parameters. The time series shown in (H) (same as the grey curve in Figure 3A) is obtained by subtracting from the raw gravity signal (A) the effects shown in panels B to F.