[56] For tensor contractions, the Einsums library of Turney and Briggs is used. Unless otherwise stated, the preceding DLPNO-CCSD computation for DLPNO-CCSD(T)/T is evaluated using the TightPNO setting as defined in our prior work, with the exception that the T DIAG SCALE parameter has been revised to 3 • 10 -2 instead of 10 -3 .