No detection of large-scale magnetic fields at the surfaces of Am and HgMn stars M. Aurière, G. A. Wade, F. Lignières, A. Hui-Bon-Hoa, J. D. Landstreet, I. Kh. Iliev, J.-F. Donati, P. Petit, T. Roudier and S. Théado A&A, 523 (2010) A40 Published online: 16 November 2010 DOI: 10.1051/0004-6361/201014848