Resulting degrees of linear polarization P_l (top) and circular polarization P_c (bottom) for perfectly (left) and imperfectly (right) aligned dust grains depending on inclination angle at a wavelength of 811 μm for the ideal Bonnor−Ebert sphere setups as presented in Sect. 3.1. For the degree of linear polarization P_l the mean values are plotted as solid lines and the peak values are in dashed lines. For circular polarization P_c the lowest values are plotted as solid lines, the highest values as dashed lines. The details of all model setups are listed in Table 1.