XMM-Newton survey of two upper Scorpius regions C. Argiroffi, F. Favata, E. Flaccomio, A. Maggio, G. Micela, G. Peres and S. Sciortino A&A, 459 1 (2006) 199-213 Published online: 12 September 2006 DOI: 10.1051/0004-6361:20065674