Generalized Lomb-Scargle periodograms of Lalande 21185 for the different data sets and the combined CARMENES and SOPHIE data. Residual periodogram of the one-planet fit and the one-planet GP simultaneous fit for the combined CARMENES and SOPHIE data are also shown. Marked frequencies represent the claimed planet at 12.95 d by (Díaz et al. 2019; green), photometric stellar rotational period (red), the claimed planet candidate by (Butler et al. 2017; orange), and the long-term period (blue).