Mean polarized power spectra for the toy model filament with ψ^bg = 0° and various values of the filament polarization angle ψ^fl. The EE (blue), BB (green), and EB (orange) angular power spectra are given at two different frequencies: 100 (continuous line) and 400 GHz (dashed line). Each spectra was normalized by the maximum value of . Left: no SED distortions: β^fl = β^bg = 1.5. Right: with SED distortions: β^fl = 1.8 and β^bg = 1.5.