Modeling time delays in the X-ray spectrum of the Seyfert galaxy MCG-6-30-15 R. W. Goosmann, B. Czerny, V. Karas and G. Ponti A&A, 466 3 (2007) 865-873 Published online: 24 April 2007 DOI: 10.1051/0004-6361:20066071