Broad-line region structure and line profile variations in the changing look AGN HE 1136-2304 W. Kollatschny, M. W. Ochmann, M. Zetzl, M. Haas, D. Chelouche, S. Kaspi, F. Pozo Nuñez and D. Grupe A&A, 619 (2018) A168 Published online: 21 November 2018 DOI: 10.1051/0004-6361/201833727