Fig. 4
Left column: generalized Lomb-Scargle periodograms of the HARPS and PFS RV time series, window functions, and the S-index, Hα, Hβ, Hγ, and sodium doublet activity indicators. The vertical dotted lines highlight the locations of the L 168-9 b orbital period, the stellar rotation period, and its first two harmonics. Right column: false alarm probabilities were computed from bootstrapping with replacement.
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