GLS periodograms around the frequency ranges of interest. Two upper panels: three equal subsets of the composite RV data. Each season has 66 data points: the three seasons, in order, are shown in red, blue, and green, respectively. Two lower panels: separate telescope RV datasets. The HIRES periodogram is plotted in red, the HARPS in blue, and the HARPS-N in green. Left panels: frequency related to the candidate planet (f = 0.064 d⁻¹ – P = 15.53 d). Right panels: frequency related to activity (f = 0.027 d⁻¹ – P = 36.7 d), as suggestedfrom RV analysis, Gaussian Processes as well as by several activity indicators and ASAS photometry.