CNO and F abundances in the globular cluster M 22 (NGC 6656) A. Alves-Brito, D. Yong, J. Meléndez, S. Vásquez and A. I. Karakas A&A, 540 (2012) A3 Published online: 13 March 2012 DOI: 10.1051/0004-6361/201118623