The XMM-Newton RGS spectrum of the high luminosity Seyfert 1 galaxy Markarian 509 R. A. N. Smith, M. J. Page and G. Branduardi-Raymont A&A, 461 1 (2007) 135-142 Published online: 26 September 2006 DOI: 10.1051/0004-6361:20065348