Absorption coefficients computed using DFT+U for the 8 permutations of Ni/V ordered classes are shown in Fig. . Classes A and B show a peak structure in the <4 eV energy region while classes C-H show steps in this energy range. While classes A and B have a non-zero absorption coefficient at energy values less than 1 eV, the others do not until around 1.5 eV. The densities of states for each class (see Supporting Information 35 ) reveal that the differences in classes A and B arise from an additional V d orbital in the valence band. This additional orbital would be consistent with inclusion of V 3+ 3d 2 states that are necessary to balance the V 5+ that is clearly evident in bond valence analysis. This difference also manifests itself in the calculated band gaps in Table , where the "Gap 1" values (associated with spin component 1) are significantly smaller for classes A and B. Band structure plots are also available in the Supporting Information. The inset shows the more featureless shape of the other 6 classes at low energy with the values of α offset uniformly for each.