Error statistics for the ion-containing data sets are provided in Tables S8, S9 and S10, computed with the +ai D3 versions of XSAPT, SAPT0(HF), and SAPT0(KS). Here, the trend is different and XSAPT + ai D3 outperforms both of the other meth-ods by 1-2 kcal/mol for the IL16 data set and by a lesser amount for the AHB21 data set. The fact that XSAPT + ai D3 exhibits statistically-significant error reduction as compared to SAPT0(KS) + ai D3 suggests that induction effects are large enough in these systems so that the charge-embedded XPol determinant is a better reference state for perturbation theory as compared to the use of isolated-monomer wave functions.