Constraints on companion mass and semi-major axis for GJ1125 (example source; see Appendix A for the whole sample). Top row (green): percentage of companions that can be detected by RV, SPHERE high contrast imaging (H2) and astrometry data alone. Middle row (blue): percentage of companions that can be detected by combining the three techniques (left), and that are detected by all the techniques (right). Bottom row (purple): percentage of companions that can be detected exclusively by each technique. In each plot, ‘Tot’ refers to the total detection ration integrated over the whole grid. See Sects. 3.4, 4.1, and 4.2 for more details.