Minimum mass of an unseen inner companion that would cause a false positive eccentricity signal in the relative astrometry of PZ Tel A and B by astrometric displacement of PZ Tel A due to their common orbit around their center of mass. The minimum mass is shown for all the recovered orbits with (see text). We also indicate the minimum mass of a putative inner companion detected in the IRDIS K2-band images at the angular separation at which it would need to reside.