HIPPARCOS-Gaia PMA and Gaia DR3 sensitivity to companions of a given mass (in M_Jup) as a function of the orbital semi-major axis (in au) orbiting GJ 463. Dashed, dashed-dotted, and long-dashed lines correspond to iso-probability curves for 60%, 95%, and 99% probability of a companion of given properties to produce RUWE > 1.407. The solid line identifies the combinations of mass and separation explaining the observed Δμ PMA at the mean epoch of Gaia DR3. The red hexagon and star indicate the M_b sin i value from Endl et al. (2022) and the M_b value for the prograde solution obtained in this work, respectively.