The computed average viscosity is slightly smaller than the experimental value for water of 0.8928 mPa s at 298 K given by Harris and Woolf. It is, however, perfectly consistent with the viscosity value of 0.855 mPa s reported by Gonzáles and Abascal . A slight deviation of the viscosity data from Gonzáles and Abascal reported in our earlier paper is thus identified as just a statistical effect. Note Table . Parameters describing the MD simulations of TIP4P/2004 water performed under NVT conditions at a temperature of T = 298 K and a density of ρ = 0.9972 g cm -3 . Here NW indicates the number of water molecules and Lx, Ly, and Lz represent the box lengths of the orthorhombic unit cell. The number of consecutive simulation runs of 0.5 ns length is given by nW. The direction-dependent self-diffusion coefficients DPBC,ii are determined from the slope of the cms-MSD of the water molecules over a time interval between 15 ps and 200 ps. The true self-diffusion coefficient D0 is determined according to Equation 8 and the shear viscosity η is determined according to Equation . The weighted statistical average values for D0 and η including all four systems using nW = 320 for NW = 768 and nW = 80 for NW > 768 are D0 = (2.2994 ± 0.0053) × 10 -9 m 2 s -1 and η = (0.860 ± 0.018) mPa s. All statistical errors given indicate standard errors.