Completeness map of the search of companions in the semi-major axis a – 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: HCI = High contrast imaging; Gaia = separate entry in the Gaia catalogue; Interferometry; Eclipsing binaries; PMa = Proper Motion Anomaly; RUWE = Gaia goodness of fit RUWE parameter; RV = Spectroscopic binaries. Different level of completeness are shown as different colours; the colour scale used is shown on bottom of the figure. Green points in the upper left image are the actual detections.