Periodograms of the HARPS SNF data and residuals (i.e. RV – planet signals) when using different baseline models. 1st panel: raw HARPS SNF data. 2nd panel: residuals when fitting only for the planetary signals, without any baseline. 3rd panel: residuals when fitting for the planetary signals and for linear detrending vectors of the activity indicators. 4th panel: residuals when fitting for the planetary signals and employing a SHO-GP as baseline. 5th panel: FWHM_SN. The dashed green lines represent the orbital periods of the two known planets. The dashed blue line represents the most significant peak in the periodogram of the FWHM_SN activity indicator.