Time series (left panels) and GLS periodograms (right panels) of selected ancillary observables. The best-fit second order polynomials were subtracted from the Bisector Velocity Span and the FWHM time series. The red vertical lines in the periodograms indicate the frequency of the detected planet candidate. In the Hα time series, we also present the data corresponding to two other SP3 targets (see text for details): blue triangles for Gl 514and red squares for Gl 686. A version of the periodograms using a linear frequency scale in the x-axis is provided in Appendix A (Fig. A.2).