Monte Carlo analysis of MEGA microlensing events towards M 31 G. Ingrosso, S. Calchi Novati, F. De Paolis, Ph. Jetzer, A. A. Nucita and F. Strafella A&A, 445 2 (2006) 375-385 Published online: 16 December 2005 DOI: 10.1051/0004-6361:20053502