For simplicity throughout the discussion in this paper, we refer to only standard TightPNO (with T CutP N O = 10 -7 ) as "TightPNO"; the other approaches are all based on TightPNO with only the one threshold changed, so we label them with their T CutP N O value or type of CPS extrapolation. We also use DLPNO-CCSD(T) to refer to DLPNO-CCSD(T 1 ) with iterative triples, and specify DLPNO-CCSD(T 0 ) where necessary.