CAIXA: a catalogue of AGN in the XMM-Newton archive - III. Excess variance analysis G. Ponti, I. Papadakis, S. Bianchi, M. Guainazzi, G. Matt, P. Uttley and N. F. Bonilla A&A, 542 (2012) A83 Published online: 13 June 2012 DOI: 10.1051/0004-6361/201118326