Exploring the nuclear environment of the NLS1 galaxy Arakelian 564 with XMM-Newton RGS R. A. N. Smith, M. J. Page and G. Branduardi-Raymont A&A, 490 1 (2008) 103-112 Published online: 11 September 2008 DOI: 10.1051/0004-6361:200810151