Upper panel: phase-folded RVs and fitted signals to the preferred Doppler period of 2.22704 d. The phase-folded fit to the BIS is also provided. For illustration purposes the BIS data have been shifted and multiplied by 10. Right panel: semi-amplitude K of the signal as a function of wavelength. The best fit to a linear model representing the wavelength dependence of K is given as a thick dashed line. The semi-amplitudes derived from the full spectrum (using CCF and HARPS-TERRA measurements) are also shown as solid brown circles. Note that both measurements provide incompatible results, which provides yet another test to assess the reality of a Doppler signal.