Study of the X-ray activity of Sagittarius A* during the 2011 XMM-Newton campaign (Corrigendum) Enmanuelle Mossoux, Nicolas Grosso, Frédéric H. Vincent and Delphine Porquet A&A, 580 (2015) C2 Published online: 30 July 2015 DOI: 10.1051/0004-6361/201424682e