The effective temperature scale of M dwarfs A. S. Rajpurohit, C. Reylé, F. Allard, D. Homeier, M. Schultheis, M. S. Bessell and A. C. Robin A&A, 556 (2013) A15 Published online: 17 July 2013 DOI: 10.1051/0004-6361/201321346