Radial velocities of the four planet-host stars, from HARPS-N (blue) and SOPHIE (red), and 1σ error bars. On each of the four plots, the left panel shows the radial velocities as a function of time, the right panel shows the phase-folded data, the upper panel shows the data over-plotted with the best circular model (black line), and the lower panel shows the residuals. The parameters of the fits are given in Tables 4 and 5.