Fluctuations of the intergalactic ionization field at redshift z ~ 2 I. I. Agafonova, S. A. Levshakov, D. Reimers, H.-J. Hagen and D. Tytler A&A, 552 (2013) A83 Published online: 29 March 2013 DOI: 10.1051/0004-6361/201220818