Flares from small to large: X-ray spectroscopy of Proxima Centauri with XMM-Newton M. Güdel, M. Audard, F. Reale, S. L. Skinner and J. L. Linsky A&A, 416 2 (2004) 713-732 Published online: 27 February 2004 DOI: 10.1051/0004-6361:20031471