Overview of the results of the analysis of the FORS2 data of CPD −62° 2124 using the Bonn pipeline and considering the hydrogen lines. The top-left panel shows the derivative of Stokes I. The regions used for the calculation of the magnetic field are marked by a thick blue line close to the top of the panel. Bottom-left panel: the top profile shows Stokes I arbitrarily normalised to the highest value, the middle red profile shows Stokes V (in %) shifted upwards for visualisation reasons and the bottom blue profile shows the spectrum of the N parameter (in %). The green asterisks mark the points that have been removed by the σ clipping algorithm. The pale blue strip superimposed upon the N profile shows the uncertainty associated with each spectral point. The thick green bar on the left side of the spectrum of the N parameter shows the standard deviation of the N profile. The top-right panel shows the linear fit used for the determination of the magnetic field using the Stokes V (i.e. ⟨ B_z ⟩). The red solid line shows the best fit. From the linear fit we obtain ⟨ B_z ⟩= 5222 ± 123 G. The bottom-right panel is the same as the bottom-left panel, but for the null profile (i.e. ⟨ B_z ⟩). From the linear fit, we obtain ⟨ B_z ⟩= 25 ± 95 G.