A similar analysis for the L7 + bbr data set using augmented basis sets (RI-MP2/aug-cc-pVXZ level with X = D or T) is shown in Fig. . Addition of diffuse functions significantly reduces the DLPNO errors, eliminating the outliers that are evident in Fig. (a) and 6(b), and for T CutPNO ≥ 3.3 × 10 -7 all of the errors are 1.5 kcal/mol. That said, these errors do oscillate as a function of T CutPNO when the aug-cc-pVDZ basis set is used, as was seen with S66. This undesirable behavior is substantially mitigated, though not entirely eliminated using aug-cc-pVTZ. A more comprehensive examination of the impact of diffuse functions is postponed until Section III I.