Radial profiles of the mass accretion flux in the disc midplane in units of solar masses of gas per year. The plot shows the mass flux computed at the edges of each grid point at t = 10⁴ yr (solid curve) and t = 3 Myr (dashed curve), corresponding to the beginning and the end of our simulations, respectively. The accretion flux is positive up to about 120 au and then becomes negative. A positive (negative) accretion flux indicates gas transport towards (away from) the star, which is consistent with the predictions of viscous evolution.