Extrapolated DLPNO[N/T]-MP2 errors for the individual S66 dimers are shown in Fig. ; these should be compared to the errors prior to extrapolation, which appear in Fig. . For the extrapolated results, all of the errors are < 0.04 kcal/mol. This is comparable to what is obtainable using the normal-MP2 threshold (T CutPNO = 10 -8 ) without extrapolation. For these small systems, one has reached a point of diminishing returns at this value of T CutPNO .