Top panel: azimuthally averaged surface density profile for simulation HD_Bae. Bottom panel: azimuthally averaged η parameter. The planet is kept on a fixed circular orbit at r/r_p = 1 and the ticks on the x axis (as well as the vertical black lines) indicate the values of η ~ 0 with a positive slope. The horizontal black line corresponds to η = 0. The damping region extends radially from r_min/r₀ to the dot dashed line.