Figure presents the basis-set dependence for the errors in total interaction energies along with S66-averaged values of each energy component: E elst , E exch , E ind , and E disp . The average dispersion energies are considered in Fig. and in view of the results presented in Section 4 .3, it is not surprising that all of the basis sets examined afford values within 0.3 kcal/mol of the def2-QZVPD result. As such, we will not consider the dispersion energies in any more detail.