Maximum-likelihood periodograms of the joint HARPS (preand post-2015) and CARMENES-VIS RVs (panel 1: HARPS_TERRA; panel 2: HARPS_NAIRA; panel 3: HARPS_{Trifonov et al.}). The periods corresponding to the highest peaks are indicated, as are the analytical FAP levels. Offsets have been subtracted from the HARPS and CARMENES RVs, as derived by the MLP procedure. Lower panel: window function of the combined dataset.