Vorticity profile of the vortex, prior to the insertion of the magnetic field. We measure the vertical vorticity in the midplane of the simulation against the elliptical radius, in the grid points boxed by the thin black line as shown in the upper panel. The modulus of the vorticity is plotted in the lower panel. The conclusion is that the vortex core has an angular velocity profile close to uniform, with shear where it couples to the Keplerian flow. The dashed lines in the lower panel mark the position of the dotted ellipses in the upper panel. They have an aspect ratio χ = 4, and mark elliptical radii of r_V = 0.065 and r_V = 0.13. The inner one encloses the vortex core.