Generalized Lomb–Scargle periodograms (GLS) of the EPIC 246471491 RVs from CARMENES and HARPS-N. Panel a: same data and analysis is shown as panel a of Fig. 5. Panel b: GLS of the CARMENES data after removing the prominent peak at f = 0.081 d⁻¹, corresponding to P_rot = 12.1 days. In this case the frequency associated with the alias peak at ~22 days also loses all the power, and the higher peaks are located at the periodicities of the four planets. Panel c: HARPS-N data (also P_rot corrected) are added to the CARMENES data. The joint GLS shows significant periodicities for two of the four planets in this system. As in Fig. 5, horizontal lines show the FAP levels of 10 (short-dashed line), 1 (long-dashed line), and 0.1% (dot-dashed line).