Relative intensification of the Fe ii 6147.7 and 6149.3 Å lines as a function of the magnetic field strength. Different curves show results for turbulent (solid line), radial (dashed line), and azimuthal (dash-dotted line) magnetic field. The dotted line shows an empirical relation for strong-field Ap stars (Mathys & Lanz 1992). The shaded rectangular region corresponds to the intensification measurements reported for HgMn stars in the literature.