Analysis of Trans-Neptunian and Centaur colours: continuous trend or grouping? M. A. Barucci, M. Fulchignoni, M. Birlan, A. Doressoundiram, J. Romon and H. Boehnhardt A&A, 371 3 (2001) 1150-1154 Published online: 15 June 2001 DOI: 10.1051/0004-6361:20010501