We see a large enough difference between the (T 1 ) iterative triples procedure and the older (T 0 ) triples to select DLPNO-CCSD(T 1 )/TightPNO/CBS(def2-TZVPP/ def2-QZVPP) as our preferred level of theory. Due to the size of the models in the MME55 set, however, most systems required approximations to this level of theoryestimation of fully extrapolated DLPNO-CCSD(T 1 ) was done by either correcting DLPNO-CCSD(T 0 )/TightPNO/CBS (3,4) with the difference between (T 1 ) and (T 0 ) for a smaller basis set or adding a lower-level (T 1 ) triples correction to DLPNO-CCSD/TightPNO/CBS results, while TightPNO thresholds for DLPNO-CCSD(T 1 ) were estimated by extrapolating results calculated with looser values of the T CutP N O parameter following the scheme designed by Altun et al.