Mass distribution in an assembling super galaxy group at z = 0.37 Merijn Smit, Tim Schrabback, Malin Velander, Konrad Kuijken, Anthony H. Gonzalez, John Moustakas and Kim-Vy H. Tran A&A, 582 (2015) A82 Published online: 13 October 2015 DOI: 10.1051/0004-6361/201525905