Atom-centered Slater-type orbitals with empirical exponents ζ l approximated by Stewart's Gaussian expansions are used as the valence minimal AO basis set. All elements use a consistent contraction depth of six primitives per AO. The Gaussian expansions for Fr, Ra, and the actinides (principal quantum number (PQN) 7) are unavailable and thus substituted by the corresponding PQN=6 AOs. For the Lns (Z = 57 -71), f -electrons are not explicitly treated in the valence space (f -in-core approximation).