The effect of smooth, in-plane gas accretion. The pink strips show the gas accretion region for simulations starting with the initial conditions used for the gSa and gSb models. The radial disc profiles are shown in the first row. An up-turn in the radial velocity dispersion profile, σ_r(r), close to the disc break is evident in the second row, while the vertical velocity dispersion continuously decrease with r (bottom row).