Relaxation of the azimuthaly averaged radial flow, case A1. denotes time during introduction and relaxation stages (). Limits of the domain of interest (excluding wave-killing zones) are shown as dashed lines. Ṁ_init denotes the uniform value in the analytic state of the unperturbed disk described in Sect. 2. 628 snapshots covering oneorbit were averaged to obtain each line in this figure.