here R is the ionic spacing, s r,n is a functional-specific constant, R AB 0 is the species-specific vdW cutoff, and a n = 14, 16 for n = 6 and n = 8, respectively. The exponential nature of Fermi damping makes it more aggressive at damping and thus the energetic contribution may fall off more rapidly at smaller distances. These considerations are in addition to the different correlation coefficients and the fact that Grimme D3 explicitly considers the atomic coordination number.