Evolution of the relative vorticity (first and third row) and balance of the vorticity source terms (second and fourth row) along a single streamline in the κ_const -disk simulation. The streamlines for these measurements are chosen from the 3D sets displayed in Fig. 5. For the hot protoplanet (bottom two rows) the extremal outer circulating streamline is selected, and for the cold protoplanet (top two rows) we select an outer circulating streamline with a comparable Hill sphere crossing time. Azimuthal (left), radial (middle), and polar (right) components of the vorticity (black solid curve), and the baroclinic term (blue solid curve), stretching term (orange dashed curve), and twisting term (magenta dotted curve) are displayed using scaled code units. The grey rectangle marks the Hill sphere crossing. We point out that the source terms represent the rate of change of the vorticity and also that the vertical range is not kept fixed among individual panels.