Time series of the RVs calculated from HARPS-N spectra with the DRS and TERRA pipelines, and their GLS periodograms. First column: RV timeseries. The mean value has been subtracted from the original DRS data. Second column: The corresponding GLS periodograms of the two RV dataset. FAP levels are of 1% and 10% are indicated by yellow and red horizontal lines, respectively. They are calculated through a bootstrap analysis. Third column: GLS periodograms of the pre-whitened RV data.