An S-shaped arc in the galaxy cluster RX J0054.0-2823 C. Faure, E. Giraud, J. Melnick, H. Quintana, F. Selman and J. Wambsganss A&A, 463 3 (2007) 833-837 Published online: 05 December 2006 DOI: 10.1051/0004-6361:20065045