Azimuthally averaged surface density profiles (top) and radial disc eccentricity (bottom) for our reference setup (R_min = 0.345 au) with a zero-gradient outflow inner boundary condition after 16 000 binary orbits. Coloured solid lines show results from simulations with different resolutions or different grid-spacing in the R-direction (logarithmic and uniform spacing). The initial density profile is also shown as a dashed black line. All simulations were performed with Pluto.