Panel (c) shows a comparison between the static dielectric constant calculated by PBE+MBD and by GW . The GW value corresponds to the dielectric function value at 0 frequency and 0 wave-vector, ε(ω = 0, q = 0). The DFT value is obtained by using the MBD polarizability in the Clausius-Mossotti relation, as described in Ref. . The comparison reveals that the DFT values are narrowly distributed around 3 and, in general, do not correlate with the GW values. For some materials the values obtained from PBE+MBD may fortuitously agree with experimental and/or GW values; 194 however, even with the self-consistent screening approach used in the MBD method, 127, 128 DFT does not capture the many-body physics contained in the GW dielectric function. This demonstrates that it is important to consider larger sets of materials to assess the reliability of methods.