Rotation curves extracted from SPH simulations. Left: rotation curves in the midplane of the disc extracted from the SPH simulations with H/R_100au = 0.075 after 20 orbits at the outer disc radius, for different disc-to-star mass ratios (solid lines). The black dash-dotted line shows the rotation curve of the model given by Eq. (5), including the pressure gradient term with zero disc mass. Except for profiles obtained with a disc-to-star mass ratio of 0.01, the rotation curves are distinct from a model without the disc self-gravity. Right: same as left panel but with M_disc = 0.1 M_⊙, with rotation curves extracted for different heights (blue solid lines), and compared to the one obtained in the midplane (z = 0, black dashed-dot line).