Standard and stacked Lomb-Scargle periodograms of the RV data. Left panel: periodogram of the raw (top), filtered (middle), and residual (bottom) LBL RV data, including a candidate planet on a 21.14 d circular orbit in the MCMC modeling. The dashed vertical cyan lines trace the stellar rotation period and the candidate planet orbital period, and the dashed horizontal lines indicate a 0.1% FAP level in the periodogram of the RV data. The orange curve depicts the periodogram of the window function. Right panel: stacked periodograms of the filtered LBL RVs, as a function of the number of RV points included in the Fourier analysis. The color-scale indicates the logarithmic power in the periodogram. The vertical dashed line traces the candidate planet orbital period.