Polarized phase function (S_{12, HG}) as a functionof scattering angle θ. Shown are the parameterized polarized phase functions from our best-fit disk model for g = 0.60 ± 0.09 (black line and gray area) and the range (red area, enclosing values between the 16% and 84% quartiles) of the best-fit model (s = 0.34μm, porosity = 0.01–0.99) of this phase function, considering a DHS. Additionally shown are the polarized phase functions resulting from the “low”-χ² regions indicated in Fig. 5. The phase functions were sampled around grain sizes and porosities of about 1 μm and 0.80 (blue area) and grains larger than 100 μm and porosities below 0.6 (green area), respectively. The range of possible scattering angles (θ = 9.14° to θ = 170.86°) observable with the used mask is indicated by the blue shaded area.