Possible magnetic field variability during the 6.7 GHz methanol maser flares of G09.62+0.20 W. H. T. Vlemmings, S. Goedhart and M. J. Gaylard A&A, 500 2 (2009) L9-L12 Published online: 05 May 2009 DOI: 10.1051/0004-6361/200912298