A rather pronounced post-edge feature is present between 407-411 eV, with peak intensity at around 409 eV. PE-CCSD is evidently the only method in Figure capable of satisfactorily reproducing the entire experimental spectrum of both systems. All three transition-potential approaches considered in Ref. 13, the half-core-hole (HH) transition potential method,the full-core-hole (FH) transition potential method,and the full core-hole excited (XFH) approximation yield spectra with a very rapid intensity decay after the sharp main-edge feature. We thus conclude that inclusion of double excitation effects (as well as solvent) in the wavefunction parametrization is important to account for the excitation and relaxation processes at play, not only in the pre-and main-edge regions but also in the post-edge region, as also indicated by the failure of the PE-CC2 approach.