1. University Grenoble Alpes, F-38000 Grenoble, France
2. CEA, LETI, MINATEC Campus, F-38054 Grenoble, France
3. LSI, CNRS, CEA, École Polytechnique, F-91128 Palaiseau, France
4. European Theoretical Spectroscopy Facility (ETSF)
5. LPS, CNRS and University Paris Sud, F-91405 Orsay, France
6. CNRS, Institut Néel, F-38042 Grenoble, France