Left: fraction of bound disk particles (f_bound) is plotted as a function of time. Different colors correspond to different values of the initial inner radius (R_in) and initial outer radius (R_out) of the circumbinary disk. The dashed black line indicates 70 kyr, where the bound fraction has settled to its first plateau. Right: radial distribution of disk particles at 70 kyr as a function of the distance to the binary center-of-mass. The disks in these preliminary runs consist of 10³ SPH particles.