Distribution of polarization angles and their observatinal uncertianties. Top-left panel: dispersion of polarization angles for the atomic region. The solid cyan profile corresponds to the fitted Gaussian. The mean (µ), standard deviation (σ), and amplitude (α) of the fit are (µ, σ, α) = (63°, 18°, 9). Top-right panel: polarization angle error distribution. Bottom panels: same as for the upper panels, but for the molecular region. The free parameters of the fitted Gaussian are (µ, σ, α) = (12°, 15°, 8).