Overview of the results of the analysis of the FORS2 data of HD 46328, collected on 9 April 2013, considering the hydrogen lines, using the Potsdam pipeline. Top left panel: Stokes I arbitrarily normalised to the highest value. Top right panel: the top profile shows Stokes V (in %), while the bottom profile shows the spectrum of the N parameter (in %). The Stokes V spectrum is shifted by 0.5 upwards for better visibility. The regions used to calculate the magnetic field are marked by horizontal lines close to the top of the panel. Bottom left panel: linear fit to Stokes V. Bottom middle panel: linear fit to the N spectrum. From the linear fit, we determine ⟨N_z⟩ = −32 ± 61 G. Bottom right panel: distribution of the magnetic field values P(⟨B_z⟩), obtained via bootstrapping. From the distribution P(⟨B_z⟩), we obtain the most likely value for the longitudinal magnetic field ⟨B_z⟩ = 438 ± 60 G. We note that the gaps in the region around Hδ in the two upper panels result from masking an internal reflection in that spectral range.