The sub-damped Ly α system toward HE 0001-2340: galaxy formation at z ≈ 2 P. Richter, C. Ledoux, P. Petitjean and J. Bergeron A&A, 440 3 (2005) 819-829 Published online: 05 September 2005 DOI: 10.1051/0004-6361:20042064