GLS periodograms around the frequency ranges of interest for two subsets of the original RV data. The first season has 61 data points and its periodogram is black (FAP: 0.1%, 1%, 10% horizontal black dotted lines), the second season has 75 data points and is plotted in red (FAP: 0.1%, 1%, 10% horizontal red dashed lines). The two upper panels refer to the frequencies related to activity (upper left: f = 0.0235 d^-1 – P = 42.5 d; upper right: f = 0.0326 d^-1 – P = 30.7 d). The two lower panels refer to the frequencies related to the candidate planets (lower left: f = 0.0729 d^-1 – P = 13.7 d; lower right: f = 0.3773 d^-1 – P = 2.65 d). The relevant frequencies derived from all the methods used on the full dataset are indicated with vertical lines green from RV analysis, blue from activity indexes, and orange from photometry (see Sect. 5).