Iron lines from transient and persisting hot spots on AGN accretion disks R. W. Goosmann, M. Mouchet, B. Czerny, M. Dovčiak, V. Karas, A. Różańska and A.-M. Dumont A&A, 475 1 (2007) 155-168 Published online: 04 September 2007 DOI: 10.1051/0004-6361:20078273