both hierarchies are labeled "loose/normal/tight" so that each term mean something different for MP2 than it means for CCSD(T). 94,95 Therefore, we will distinguish between "loose-MP2" settings and "loose-CCSD(T)" settings, with similar nomenclature for the normal and tight settings. PNO thresholds used in this work are provided in Table , specified in terms of the ORCA parameters T CutDO and T CutPNO . 94 For MP2, these reflect the suggested values in Ref. 94 although for CCSD(T) we have set T CutDO = 10 -2 in all cases, which is the "normal" value for MP2 calculations. The most important of these thresholds is T CutPNO and as such we take T CutDO to be pinned to T CutPNO , so that if we report, for example, that T CutPNO = 10 -9 (the "tight-MP2" setting), then it is implied that T CutDO = 5 × 10 -3 . Note that the "tight-CCSD(T)" setting is comparable to the "loose-MP2" setting, reflecting recommendations in Ref. 94.