We defined our benchmark binding energies as the average of the CP and non-CP energies at the CBS extrapolation limit (i = DZ-TZ). Mackie and DiLabio showed that CP BEs tend to converge to the complete basis set limit from above, while the non-CP BEs converge from below. Therefore, averaging the two quantities generally results in quicker convergence to the CBS limit. These average binding energies show a quick convergence to the CBS limit for most noncovalent interactions studied herein. A selected example of the convergence of BE i ave is depicted in Figure ; since BE CP and BE non-CP converge to the same value at the CBS limit (see right-hand sides of equations 1 and 3), BE i ave will more rapidly converge to the complete basis set limit than the individual counterpoise and non-counterpoise binding energies. However, the convergence of the average of the CP and non-CP BEs is not always ideal, i.e., when the CP and non-CP BEs do not converge from above or below, respectively.