The metal contents of two groups of galaxies Y. G. Grange, J. de Plaa, J. S. Kaastra, N. Werner, F. Verbunt, F. Paerels and C. P. de Vries A&A, 531 (2011) A15 Published online: 01 June 2011 DOI: 10.1051/0004-6361/201016187