Evolution of dust in the Orion Bar with Herschel - I. Radiative transfer modelling H. Arab, A. Abergel, E. Habart, J. Bernard-Salas, H. Ayasso, K. Dassas, P. G. Martin and G. J. White A&A, 541 (2012) A19 Published online: 23 April 2012 DOI: 10.1051/0004-6361/201118537