Region of interest of the Δ ln L periodograms of the combined RV datasets of Gl 49 (HARPS-N S2-S6 and CARMENES). Top panel: difference in ln L from a linear null model including additional jitters and offsets, to a model including one additional Keplerian (top panel). The following panel then shows the periodogram of the data with this Keplerian subtracted. From the second panel, from top to bottom: we have subtracted a best-fit Keplerian curve with periods of 9.37, 19.09, 13.85 and 18.91 d, as shown by the broad red vertical lines. The dashed horizontal red lines indicate the 0.1 and 1% FAP values calculated by bootstrap randomization using a single Keplerian model on the datasets (see Sect. 4.2)