Dependence of fitted Hubble constant (H₀) and group mass (M_group) on the choice of minimum and maximum selection radii. The blue curves correspond to the minor-infall model, and the red curves correspond to the major-infall model. The coloured area corresponds to the 1σ uncertainty on the results. Top panels: Fitted values of H₀. Bottom panels: Fitted values of M_group. Left: Variation of H₀ and M_group as function of minimum radius, r_minimum, used on selected galaxies for the fit. In these cases, the maximum radius was fixed at 6 Mpc, and galaxies close to the CoM and apparently infalling towards it were kept. Right: Variation of H₀ and M_group as function of maximum radius, r_maximum. Here, the minimum radius was fixed at 1.4 Mpc, and nearby galaxies infalling towards the CoM were kept.