. Table shows that this even-tempered extension ("even1f1g") produces density fitting errors that are approximately the same as those from freely optimized exponents. Similar explorations at the DZ and QZ level (see Supplementary Material) show that even-tempered extensions also produce satisfactory results, with DZ requiring one additional f exponent and QZ requiring 1f1g1h. The Supplementary Material also shows that augmenting the ABSs with the same patterns of even-tempered extensions produces negligible density fitting errors for Se and Po.