Gas velocities for a continuous dust size distribution with a power-law index of −3.5, ranging from 0.1 μm to 1 cm at a dust-to-gas ratio of f_dtg=0.1. The solid lines show the semi-analytic solutions from Eqs. 70 (top panel) and 71 (bottom panel) in Benítez-Llambay et al. (2019), based on the gas density profile after ten orbits. Circles indicate the corresponding gas velocities computed by Dusty FARGO-ADSG at the same output time.