Recall that in modifying Eq. (3) for use with EFP, Gaussian exponents were taken as stand-ins for the Tang-Toennies damping parameter b in Eq. ( ). We apply the same substitution here, only using the general form of the Gaussian overlap exponents, γ = αβ/(α + β). Note that γ in Eq. ( ) has dimensions of (length) -2 . Manipulating that expression to substitute a γ-dependent factor in place of b n in the denominator of Eq. ( ) affords the expression