Hello, When running a QR-TDA (or QR-CIS) calculation with Dalton, the `E^[3]` contribution is disabled, per [this commit](https://gitlab.com/dalton/dalton/-/commit/5217424dd9e152e964a575e0bc1c4d23990d6c00). Effectively, this means that what some authors refers to as "orbital relaxation" (see, *e.g.*, [10.1021/j100180a030](https://pubs.acs.org/doi/10.1021/j100180a030), or more recently [10.1021/acs.jctc.7b01008](https://pubs.acs.org/doi/10.1021/acs.jctc.7b01008)) is not there in TDA/CIS. Would any of you have a publication that discuss why this correction should not be there? It is mentioned, *e.g.*, in [10.1103/PhysRevA.77.012510](https://journals.aps.org/pra/abstract/10.1103/PhysRevA.77.012510), but they just say that "the exchange correlation coupling term vanish", without further development. Thanks in advance :smile: