Are there tangled magnetic fields on HgMn stars? O. Kochukhov, V. Makaganiuk, N. Piskunov, S. V. Jeffers, C. M. Johns-Krull, C. U. Keller, M. Rodenhuis, F. Snik, H. C. Stempels and J. A. Valenti A&A, 554 (2013) A61 Published online: 04 June 2013 DOI: 10.1051/0004-6361/201321467