We next consider interaction energies for a set consisting of 131 configurations of F -(H 2 O) n , n = 3-7, where benchmark interaction energies for the ion were computed at the RI-MP2/ aug-cc-pV[T/Q]Z level as described in Section 2 .1 .1. These benchmarks range from ∆E = -55 kcal/mol to ∆E = -105 kcal/mol across the data set and error distributions for various DFT calculations, relative to these benchmarks, are presented in Fig. in the form of histograms over the 131 configurations. The ωB97M-V functional affords excellent agreement with the benchmarks, with a mean error in |∆E| of only 0.4 kcal/mol (tending toward overestimation) and a narrow distribution of errors. B3LYP+D3 also affords good agreement with the benchmarks, with a mean error in ∆E of 0.7 kcal/mol in the opposite direction.