Top panel: time series of the radial velocities of HD 106315. Bottom panel: radial velocities of HD 106315 phase folded on the ephemeris of planet b (left panel) and of planet c (right panel). For the phase folded plots, we show both data binned to 0.05 in phase (in red-dark) and unbinned data (grey). For all the cases, the errors include the estimated jitter added quadratically and we overplotted the best fitted model presented in Table 2, which includes the Gaussian process to model the activity. In the top panel we also show a model without GPs, which includes the two Keplerian orbits (dash-line).