A variable magnetic disc wind in the black hole X-ray binary GRS 1915+105? A. Ratheesh, F. Tombesi, K. Fukumura, P. Soffitta, E. Costa and D. Kazanas A&A, 646 (2021) A154 Published online: 19 February 2021 DOI: 10.1051/0004-6361/202038621