Left panel: maximum values of the latitudinal velocity components, |v_θ|, of 4 M_⊙ HVSs as a function of their ejection velocities, v_ej, in Newtonian gravity with different shapes of the dark matter halo and in QUMOND with γ = 1 and γ = 2; symbols and models are detailed in the inset. The vertical scatter in the plot originates from the random directions of the star ejection. The vertical dotted lines indicate v_ej = 710 and v_ej = 750 km s⁻¹. In all the models except QUMOND with γ = 2, the maximum |v_θ| substantially drops for stars with v_ej ≳ 750 km s⁻¹. For QUMOND with γ = 2, the maximum |v_θ| drops for stars with v_ej ≳ 710 km s⁻¹. Right panel: maximum values of the azimuthal velocity components, |v_ϕ|, of 4 M_⊙ HVSs as a function of their ejection velocities, v_ej, in two Newtonian gravity models where the axes of symmetry of the baryonic matter and of the dark matter halo are misaligned. The other models considered in the left panel do not appear because they are axisymmetric and have zero |v_ϕ| values. The vertical scatter originates from the random directions of the star ejection. The vertical dotted line indicates v_ej = 750 km s⁻¹.