Characterizing SL2S galaxy groups using the Einstein radius T. Verdugo, V. Motta, G. Foëx, J. E. Forero-Romero, R. P. Muñoz, R. Pello, M. Limousin, A. More, R. Cabanac, G. Soucail et al. (4 more) A&A, 571 (2014) A65 Published online: 13 November 2014 DOI: 10.1051/0004-6361/201423696