Symbiotic stars in X-rays. II. Faint sources detected with XMM-Newton and Chandra N. E. Nuñez, G. J. M. Luna, I. Pillitteri and K. Mukai A&A, 565 (2014) A82 Published online: 16 May 2014 DOI: 10.1051/0004-6361/201322999