4.3.1. Averaged Components for S66. Individual energy components for the S66 systems are plotted in Fig. , where the calculations were performed at the XSAPT + MBD level in each of the six best-performing basis sets that were identified in Section 4 .2. These data will not be discussed in detail because the variations between basis sets are mostly quite small. This does demonstrate that the basis sets that we previously identified as the best-performing ones achieve this status not through any kind of error cancellation but rather because they offer a converged (or nearly converged) description of each energy component.