The 1s → LUMO data were not used to fit β so the performance of shifted-XTPM for these K-edge transitions constitutes a true test of the method. Error statistics error [eV] for that data set, obtained without refitting β, are listed in Table . By the standards of other Slater-type approaches, all methods perform reasonably well and the SCAN and B3LYP functionals achieve MAEs of only 0.3 eV. Consider both 1s → LUMO and also higher-lying near-edge transitions, B3LYP is probably the best overall functional and its accuracy is comparable to that of both ∆SCF and IP-TPM approaches. Shifted-XTPM using B3LYP is therefore recommended for full-spectrum XAS calculations.