Figure shows the distribution of thermal corrections to the free energies, calculated relative to ωB97X-D3BJ/aug-cc-pVTZ, where the absolute values can be seen in Figure in Section S3.1 of the SI. This reference was chosen due to its good performance compared to DKH-CCSD(T), as shown in Table . B3LYP and PW91 show the largest deviations with mean errors of 1.75 kcal/mol and 3.27 kcal/mol, respectively. Meanwhile using M06-2X leads to nearly identical thermal corrections. This means that M06-2X could be used as an alternative to ωB97X-D3BJ with no significant change in results.