Snapshots of the surface density for infinite disc models with q = 0.5 and H/R = 0.05 for different viscosities, ranging from α = 0.1 (left) to α = 0.001 (right). We show the inner region of the disc for the higher-resolution models in their final state at the times indicated. The dashed white lines indicate the ellipses fitted to the cavity with the parameters quoted. The blue dots mark the position of the stars.