The top panel shows analytical representations of empirically determined PDFs for the vertical flux density B_v and the total flux density B that are used for the calculations of the average flux densities  ⟨ B_v ⟩  and  ⟨ B ⟩  in the bottom panel. These averages are given as functions of the maximum flux density (truncation value) allowed in the integration over the PDF. B_H is the field strength derived from the Hanle depolarization, assuming a single-valued field with an isotropic angular distribution.