Footprints in the wind of Vela X–1 traced with MAXI V. Doroshenko, A. Santangelo, S. Nakahira, T. Mihara, M. Sugizaki, M. Matsuoka, M. Nakajima and K. Makishima A&A, 554 (2013) A37 Published online: 31 May 2013 DOI: 10.1051/0004-6361/201321305