Overview of FORS2 analysis and results from the observations of HD 144941 collected on March 15, 2021 considering the full spectrum. Top left panel: derivative of Stokes I. The thick blue line on top of the panel indicates the region used to compute ⟨B_z⟩. Bottom left panel: from top to bottom, the panel shows the Stokes I spectrum (black) arbitrarily normalised to the highest value, the Stokes V spectrum (in %; red) rigidly shifted upwards by 0.5% for visualisation reasons, and the spectrum of the N parameter (in %; blue). The green asterisks mark the points that were removed by the sigma-clipping algorithm. The pale blue strip drawn on top of the N profile showsthe 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. Top right panel: linear fit from which ⟨B_z⟩ is determined. The red solid line shows the best fit giving ⟨B_z⟩ = −7626 ± 86 G. Bottom rightpanel: same as the top right panel, but for the N profile (i.e. ⟨N_z⟩), from which we obtain ⟨N_z⟩ = −32 ± 71 G.