Note that self-diffusion coefficients D PBC obtained from simulations with cubic periodic boundary conditions differ from the true selfdiffusion coefficient for an infinitely large system D 0 . 51 To obtain the system-size independent, true self-diffusion coefficients, Busch and Paschek recently introduced the Or-thoBoXY approach, exploiting the directiondependent effect of hydrodynamic interactions between particles in systems with non-cubic periodic boundary conditions: By choosing an orthorhombic box geometry with "magic" box length ratios of L z /L x = L z /L y ≈ 2.7933596497, the system-size dependence of the self-diffusion coefficients in x-and ydirections disappears, and the true self-diffusion coefficient D 0 can be obtained as the arithmetic mean of the x-and y-component of the diffusion tensor.