Top left panel: comparison between the |⟨B_z⟩| values obtained by analyzing the whole spectrum with the Bonn pipeline and the Potsdam pipeline. Top right panel: same as top left panel, but for the uncertainties of the ⟨B_z⟩ values obtained analyzing the whole spectrum. Bottom left panel: same as top left panel, but for the |⟨B_z⟩| values obtained analyzing only the hydrogen lines. Bottom right panel: same as top left panel, but for the uncertainties of the ⟨B_z⟩ values obtained analyzing only the hydrogen lines. Filled circles are from measurements presented in this paper, while open circles are from the measurements presented in Fossati et al. (2015). The extreme outlier in the bottom right panel in the lower right is from the Be star HD 110432 (see the discussion in the text).