Generalized Lomb-Scargle periodograms of the activity indices derived from SERVAL for the CARMENES data. In all panels, the broken magenta lines indicate the planetary periodicities of 0.96, 6.6, and 13.6 days, and the broken red lines indicate the 19.9-, 34.6-, and 48.1-day possible rotation periods discussed here. In the top two panels, the GLS for the CRX and dLW indices are given independently for the visible and infrared channel spectra. The 10%, 1%, and 0.1% FAP levels are indicated by grey dotted, dash-dotted, and dashed horizontal lines, respectively.