1. Istituto di Astrofisica e Planetologia Spaziali, INAF, Via Fosso del Cavaliere 100, I-00133 Roma, Italy
2. Dipartimento di Matematica e Fisica ‘Ennio De Giorgi’, Università del Salento, CP 193, I-73100 Lecce, Italy
3. INFN Sezione di Lecce, CP 193, I-73100 Lecce, Italy
4. Niels Bohr International Academy, Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
5. Max-Planck Institute für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
6. I. Physik. Institut, University of Cologne, D-50937 Cologne, Germany
7. IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
8. Université Paris Diderot, AIM, Sorbonne Paris Cité, CEA, CNRS, F-91191 Gif-sur-Yvette, France
9. LERMA (UMR CNRS 8112), Ecole Normale Supérieure, F-75231 Paris Cedex, France
10. School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, UK