The Infrared Telescope Facility (IRTF) spectral library: - Spectral diagnostics for cool stars M. Cesetti, A. Pizzella, V. D. Ivanov, L. Morelli, E. M. Corsini and E. Dalla Bontà A&A, 549 (2013) A129 Published online: 11 January 2013 DOI: 10.1051/0004-6361/201219078