Confidence intervals on κH₀ and M for the Hubble flow fit using the minor (blue) and major infall models (red) with respect to the barycentre between M 81 and M 82, a starting distance for the fit of d_min = 0.5 Mpc and the two maximum distances of galaxies included in the fit of d_max = 4 Mpc (omitting the two farthest galaxies) and d_max = 7 Mpc (including all galaxies in the dataset). To obtain a robust fit, galaxies with ‖v_majj‖₂ > 500 km/s were excluded. The overlap model yields the best-fit parameter values from the 2σ regions where the minor and major infall models coincide.