A deep wide-field optical survey in the young open cluster Collinder 359 N. Lodieu, J. Bouvier, D. J. James, W. J. de Wit, F. Palla, M. J. McCaughrean and J.-C. Cuillandre A&A, 450 1 (2006) 147-158 Published online: 03 April 2006 DOI: 10.1051/0004-6361:20054105