Correlation plots and linear fits between (Q_s, q_v) and (U_s, u_v) for two values of the polarization degree, p = 1.5% (top row) and p = 2.5% (bottom row). Each column corresponds to a combination of magnetic field orientation Ψ_B⊥ = {30°, 60°} and miscalibration offset β = {3°, 7°}, increasing from left to right. The best-fit values for the slopes (absolute value) and for the intercept obtained for the correlations are given in the legend; the resulting model is shown on the scatter plot, in blue for (Q_s, q_v) and in orange for (U_s, u_v). They are expressed in MJy sr⁻¹. To generate the data, we used R_p/p = 5.42 MJy sr⁻¹, σ_ΨB⊥ = 5°, and σ_p = 0.2% to produce the dynamical range.