Illustration of the polarization angle spectral dependence from polarized mixing. Upper panel: polarization angle γ_ν as a function of frequency (in GHz) for the sum of two power laws with parameters A₁ = 2 Jy sr⁻¹, A₂ = 1 Jy sr⁻¹, β₁ = 1.8, β₂ = 1.2, 2γ₁ = 10° and 2γ₂ = 80°. The color labels the frequency between 1 GHz (dark red) and 500 GHz (dark blue). Lower panel: polarization spinor 𝒫_v (in Jy sr⁻¹) in the complex (Q, U)-plane, in the same configuration and with the same color coding. The phase of the spinor is 2γ_ν. The length of the colored bars and the lines of constant radius represent values of log₁₀(P_v). The two black lines represent the two power laws and at 500 GHz.