GLS periodograms of the time series of APF, HIRES, CARMENES, and HARPS-N RV measurements and the residuals after subtraction of different models. All the models include quadratic and linear terms to account for the long-term trend detected in the RV time series. (a) GLS periodogram of RVs after removing the long-term trend. (b) GLS periodogram of the RV residuals after fitting the 101 days signal (vertical magenta line). (c) GLS periodogram of the RV residuals after simultaneously fitting the 8.8 days (vertical red line) and 101 days signals. (d) GLS periodogram of the RV residuals after simultaneously fitting the 8.8 days, 28.6 days (vertical green line), and 101 days signals. (e) GLS periodogram of the RV residuals after simultaneously fitting the 8.8 days, 28.6 days, 38 days (vertical cyan line), and 101 days signals. (f) GLS periodogram of the RV residuals after simultaneously fitting the 8.8 days, 28.6 days, 38 days, 101 days, and 300 days (vertical orange line) signals. In all panels, the 10%, 1%, and 0.1% FAP levels are indicated by dotted, dash-dotted, and dashed grey horizontal lines, respectively. The vertical black dotted line indicates the dataset baseline. We highlight the different scale of the y axis in each panel.