Histograms of the relative frequency distribution of the surviving binary’s main orbital parameters. We show the orbital period (a), the eccentricity (b), the mutual inclination (c), and the mass ratio (d). The black line gives the total distribution of the surviving systems, while the purple line represents the fraction that would have remained imperceptible to current radial-velocity measurements (Eq. (3)). The colour code corresponds to different ranges of orbital periods (a).