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Illustration of the ladder-based classification of density functionals. Also shown at each rung are the top-performing functionals (out of 200 DFAs from rungs 1–4), as assessed using the MGCD84 database containing nearly 5000 data points.21 Adapted with permission from N. Mardirossian and M. Head-Gordon, Mol. Phys. 115, 2315 (2017). Copyright 2017 Taylor and Francis.
