Hipparchos-Gaia proper motion acceleration sensitivity to companions of a given mass (in Jupiter masses) as a function of the orbital semimajor axis (in astronomical units) orbiting GJ7. The solid line denotes the combinations of mass and separation explaining the observed proper motion acceleration at the mean epoch of Gaia DR3, based on the analytical formulation of Kervella et al. (2019) and the observed astrometric acceleration for GJ7 reported by Kervella et al. (2022). The shaded light blue region corresponds to the 1σ uncertainty domain. Both axes are plotted on a logarithmic scale.