(a) Semiamplitude (red) and phase (green) of the 150 d signal averaged over a window of size [t₀−τ, t₀+τ] where τ = T_obs/3, and T_obs is the total observation timespan. The solid lines represent the least square fit, and the shaded areas the ± 1σ intervals. Red and green dotted lines represent the mean value of the amplitude and phase, respectively. (b) In grey, HARPS-N data processed with YARARA-v2; in orange, a model of the form ${\mathrm{e}}^{-\frac{{(t-t_0)}^2}{2{\tau }^2}}(A\cos \omega t+B\sin \omega t)$, where ω, A, B, τ, and t₀ are adjusted starting from ω = 2 π/150 rad/ day.