A general catalogue of 6.7 GHz methanol masers - II. statistical analysis M. R. Pestalozzi, A. Chrysostomou, J. L. Collett, V. Minier, J. Conway and R. S. Booth A&A, 463 3 (2007) 1009-1016 Published online: 05 December 2006 DOI: 10.1051/0004-6361:20065876