LSD Stokes I (left panel) and Stokes V (right panel) profiles of μ Lep. The profiles corresponding to different observing nights are shifted vertically for clarity. The vertical scale in the Stokes V panel is expanded by a factor of 100 relative to Stokes I. The error bars for each V profile are given on the left side of the panel. The vertical dashed lines indicate the velocity range adopted for the longitudinal magnetic field measurements.