X-Shooting ULLYSES: Massive stars at low metallicity - I. Project description Jorick S. Vink, A. Mehner, P. A. Crowther, A. Fullerton, M. Garcia, F. Martins, N. Morrell, L. M. Oskinova, N. St-Louis, A. ud-Doula et al. (71 more) A&A, 675 (2023) A154 Published online: 19 July 2023 DOI: 10.1051/0004-6361/202245650