Using the least-squares chemical potentials as an anchor is similar to determining atomization energy corrections (AEC) often employed in the gas-phase community 161 . Known experimental atomization energies for species are used to determine the correction factors for the DFT energies. In a more generic way, this can be formulated as determining corrections to a set of energies to align them with known energies of higher fidelity. In the case of two DFT datasets obtained from two different functionals, we can either compare the relative enthalpies or determine atomic correction factors to align the energies of, e.g., the RPBE functional to align with the BEEF energy values. In fact, it can be shown that the least-squares anchor is also the anchor set that minimizes the sum of squared deviation between two different datasets obtained from different sources. Thus, the minimum sum of squares chemical potentials can also be used directly to align data from different sources, e.g., from different functionals such as BEEF-vdW and RPBE or different levels of theory.