Completeness map of the search of companions in the semi-major axis a (in au) – mass ratio q plane. The upper left panel is the result obtained using all the techniques considered in this paper; the remaining panels are results for the individual techniques: Phot = Eclipsing binaries; RV = spectroscopic binaries; RUWE = Gaia goodness of fit RUWE parameter; PMa = Proper Motion Anomaly; HCI = high contrast imaging; Gaia = separate entry in the Gaia catalogue. Different level of completeness are shown as different colours; the colour scale used is shown on bottom of each panel.