Coplanar 1 simulation: surface density after 1000 orbits, corresponding to ~1.65 × 10⁵ yr. The stars are shown as yellow dots. Left and centre: gas surface density after 1000 orbits (linear and log scales, respectively). Symmetric accretion streams from the disc to the stars can be seen inside the gas cavity. The cavity size obtained with CaSh is over-plotted in red. Right: dust surface density. A circular dusty ring is formed at the location of the gas pressure maximum. No evident asymmetry is visible.