Galactocentric radial velocity, v_r, as a function of the galactocentric distance, r, for HVSs ejected radially outward with an ejection velocity of v_ej = 740 km s⁻¹ in the direction , for different shapes of the DM halo. The triaxiality parameters (q_y, q_z) of the DM halos are listed in the inset. The travel time is 160 Myr. The vertical and horizontal dashed lines correspond to r = 10 kpc and v_r = 0, respectively.