Neutral chlorine and molecular hydrogen at high redshift S. A. Balashev, P. Noterdaeme, V. V. Klimenko, P. Petitjean, R. Srianand, C. Ledoux, A. V. Ivanchik and D. A. Varshalovich A&A, 575 (2015) L8 Published online: 20 February 2015 DOI: 10.1051/0004-6361/201425553