Evolved structure of a vortical disturbance seeded into a Keplerian shear flow (see Figure 6), evolved for ∼15 vortex sound-crossing times with RBV2 (top), PLUTO (middle), and ZEUS (bottom). Since the seeded vortex is not in an analytic equilibrium, it is expected that the vortex should shed Rossby waves. It appears that the substructure that develops in the flow around the vortex due to the shedding of these waves is very different in all three cases.