Volume rendering after the end of the linear phase (t = 22.5). The entire domain of the simulation is shown. The volume rendering shows the gas distribution of the two straight vortex-tubes that have formed. To visualize the vortices in the volume rendering, we only show gas densities below 9.2 × 10^-21 g cm^-3. At the back and left side of the cube (xy- and yz-planes, respectively), the dust distribution of the heaviest dust species is shown. The dust forms tubes around the gas vortices, and sheets of increased density between the tubes.