Detecting emission lines with XMM-Newton in 4U 1538–52 J. J. Rodes-Roca, K. L. Page, J. M. Torrejón, J. P. Osborne and G. Bernabéu A&A, 526 (2011) A64 Published online: 22 December 2010 DOI: 10.1051/0004-6361/201014324