We also calculated and visualized the weighted fractional occupational electron density (FOD). Overall the results are very similar to the other diagnostics. DMML, AAP and PTE all have virtually no FOD, while for Co-NHase, AH, W-FOR, Mo-Cu CODH, and the five safe NiSOD structures the FOD is small and mostly metalcentered. A few examples of some of the structures which were flagged as mildly multireference by at least one diagnostic are shown in fig. , while all others are provided in the Supporting Information (figures S4-S13). All structures for CDO have similar levels of FOD, even between ones that are flagged by all the other diagnostics and ones that are low on both the T1 and maximum T 2 amplitudes (like 3C and 5A, respectively). The same is seen for Hc, where the FOD is mild and spread relatively evenly across the whole Cu 2 O 2 core for all structures.