Fe Kα and Fe Kβ line detection in the NuSTAR spectrum of the ultra-bright Z source Scorpius X–1S. M. Mazzola, R. Iaria, T. Di Salvo, A. Sanna, A. F. Gambino, A. Marino, E. Bozzo, C. Ferrigno, A. Riggio, A. Anitra and L. BurderiA&A, 654 (2021) A102DOI: https://doi.org/10.1051/0004-6361/202039983