1. School of Mathematics and Physics
2. Queen's University Belfast
3. Belfast BT7 1NN
4. UK
5. European Theoretical Spectroscopy Facilities (ETSF)
6. CNRS/Univ. Grenoble Alpes
7. Institut Néel
8. F-38042 Grenoble
9. France
10. CNRS/Aix-Marseille Université