Surface density profiles at t = 10000 yr for standard resolution non viscous 3D simulations with different smoothing length and for an additional run with double resolution and smoothing length ϵ = 0.2 Hill radii. We call “SR” the standard resolution simulations and we use the label “HR” for the high resolution one. The "HR" simulation is a restart of the “SR” case with ϵ = 0.4 R_H (red curve) at t = 10⁴ yr. The green curve corresponds to 100 orbits after the restart.