Stellar intrinsic variability in our observables. Left panel: histogram of the stellar intrinsic RV jitter (blue: SOPHIE targets; orange: HARPS targets). Middle panel: histogram of the BIS dispersion. Right panel: BIS dispersion vs intrinsic RV jitter (SOPHIE targets are shown as blue diamonds and HARPS targets as orange crosses). The best power-law fits to the BIS rms vs RV rms distribution in the two variability regimes are shown as red solid lines.