Derived polarization percentage (color) from the two-component model introduced in Sect. 4.1 (Eq. (1)), with α = 10% (Eq. (4)), and observing frequency ν = 44 (left column), 345 (middle column), and 690 GHz (right column). Color bars are in % units. Horizontaland vertical axes are dust temperatures of the background and foreground components T_fg and T_bg; the resolutions of T_fg and T_bg in our calculations are the same with the horizontal and vertical grids. White dashed lines show T_fg = T_bg. Top and bottom rows show the cases of τ = 0.1 and 0.6, respectively. The orange line segments indicate that the observed polarization position angle is identical tothat of the emission of foreground component; otherwise the observed polarization position angle is 90° offset from that of the emission of the foreground component. Vertical white lines show the extinction corrected peak brightness temperature of IRAS 16293–2422 B (141 ± 14 K)∕e^−τ.