Gas velocity profile of the “High ε₀” simulation after 0.4 Myr (black), and the decomposition of the two velocity terms Ā v_ν (red) and (blue) (see Eq. (14)). In the inner regions, the pushing term is negligible, as the particles Stokes number is too small, and the total velocity is dominated by the damped viscous velocity Ā v_ν. In the outer regions the term overcomes the viscous evolution, and pushes gas against the pressure gradient.