Left: Reconstructed infall velocities by Eqs. (34), (37), and (46) for all subhalos (bound in dark colours, Hubble-flow subhalos in light colours) onto their parent-halo centre versus the true radial velocity by Eq. (22). Linear fits with 1-σ confidence bounds to the point clouds of the minor infall model and the velocity-difference approximation are shown in blue and grey, respectively. The fit for the major infall is not shown as its confidence bound covers the entire plot. Centre: Perpendicular velocities of all subhalos versus their distance to the observer (bound in black, Hubble-flow subhalos in grey). Only the six subhalos in the Hubble flow marked in blue have a tangential velocity close to zero. In the notation of Sect. 3, |r_subhalo|≡|r_j|. Right: Absolute value of the tangential velocity of all subhalos (bound in dark colours, Hubble-flow subhalos in light colours) versus their radial velocity. Only 337 subhalos with radial velocity close to zero also have a tangential velocity close to zero (marked in blue), while 3575 subhalos have a larger tangential velocity than radial one (marked in red).