2D Fourier analysis of the Stokes V parameter. The horizontal red line represents the star velocity, 21 km s⁻¹. The vertical white bars represent the three frequencies around 1850 d, 500 d and 250 d, while the dotted white line marks a signal around 200 d. The above picture shows, for each velocity-bin, the Fourier periodograms together with its average (red) and window function (green). On the right is shown the mean-V profile together with the star velocity (red), while the dotted line represents the null polarization level.