Gap depth vs. time and convergence ratio: for three different masses with all other numerical and physical parameters being constant, we compare the resulting gap depth as a function of orbits and the convergence measure (Σ(t) −Σ(t + dt))∕Σ(t). We see that after 400 orbits the gap depth has essentially reached its final value (up to 10–20%). The convergence rates for the gap depths are independent of opacity after a few orbits and thus their relative depth will not change. Different opacities behave identical.