An X-ray variable absorber within the broad line region in Fairall 51 J. Svoboda, T. Beuchert, M. Guainazzi, A. L. Longinotti, E. Piconcelli and J. Wilms A&A, 578 (2015) A96 Published online: 11 June 2015 DOI: 10.1051/0004-6361/201425453