Bonnsai: a Bayesian tool for comparing stars with stellar evolution models F. R. N. Schneider, N. Langer, A. de Koter, I. Brott, R. G. Izzard and H. H. B. Lau A&A, 570 (2014) A66 Published online: 20 October 2014 DOI: 10.1051/0004-6361/201424286