The uncorrected energies show a much stronger cutoff-dependence compared to those of a water molecule (Table ), because the net charge on the ions induces a long-ranged polarization of the solvent. The correction for the Coulomb interactions from Eq. ( ) accounts for this effect and leads to a much better agreement of the FG and CG+B schemes, with a maximum energy difference of about 5 kJ mol -1 . The FG/S scheme shows more significant deviations due to finite-size effects, which are not accounted for by Eq. ( ).