PDF contributions to the mean Hanle depolarization of 0.45 observed in the Sr i 4607 Å line, assuming an isotropic angular distribution. The dashed curve represents the Hanle depolarization factor as a function of field strength. The value 0.45 is reached for 60 G, which would be the field strength of a single-valued PDF. The solid curve is the cumulative contribution to the Hanle depolarization from the PDF for all fields weaker than the given field strength B. The bulk of the contribution comes from the fields weaker than the PDF half width (146 G).