Midplane gas velocities as a function of orbital distance in discs with H∕r = 0.05, α = 0.001, and Σ ∝ r−0.5. Top plot: radial velocity in units of the sound speed at r = 1.0. A negative velocity indicates an inward flow of the gas. The red line indicates the radial velocity of the unperturbed disc. Bottom plot: azimuthal velocity in units of the Keplerian velocity. If vθ is larger than 1, the gas orbits super-Keplerian, indicating the pressure bump in the disc.
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