Multiwavelength campaign on Mrk 509 - IX. The Galactic foreground C. Pinto, G. A. Kriss, J. S. Kaastra, E. Costantini, J. Ebrero, K. C. Steenbrugge, M. Mehdipour and G. Ponti A&A, 541 (2012) A147 Published online: 17 May 2012 DOI: 10.1051/0004-6361/201118679