Radial profiles of the time averaged mass-weighted disk eccentricity for different inner boundary conditions. Solid lines are averaged over 200 snapshots taken at binary apastron between T = 400 and 600T_bin. The shaded areas show the 1 σ variations. Eccentricity as well as precession are more uniform throughout the disk when open boundaries are used. The radial profiles are cut at a radius where the time averaged surface density drops below 100 times the floor value.