Finally, Galli et al. predicted a 3 A 2 → 3 E VEE of 2.152 eV using quantum defect embedding theory (QDET) with an exact double-counting (DC) correction, while they reported a value of 1.324 eV using an approximate DC correction. DC occurs in DFT-based embedding methods, while our pDMET formulation does not have this issue because HF is used as low-level theory.