Another important consequence of using state-specific embedding potentials is that the resulting ground-and excited-state wavefunction are no longer orthogonal . This even holds if the environment density is assumed to be state-independent, since the embedding potential depends also on the active system's density, which of course differs between different electronic states. If the embedding potential is constructed based on a common reference density for the active system for ground-and excited states as a further approximation, a state-universal embedding potential is obtained . This is essentially the same as the linearization approximation suggested in Ref. , which also contains a formal analysis of embedding potentials in the context of FDET, and a summary of advantages and disadvantages of different approximations.