Maximum value of the outflow speed at the Bondi (for the planets with m = 0.01, 0.05, 0.1, and 0.5) or Hill radius (for the planets with m = 1.0 and 2.0) on the midplane of the disc obtained from the fiducial (red), low-resolution (yellow), high-resolution (green), and extended-domain (blue) simulations at t = t_end. The black solid line corresponds to the analytical solution of the outflow speed derived from the analytical solution of the outflow speed derived from Eqs. (17) and (18).