Scatter plot of the fluctuations in polarized fraction, (left), and the dispersion of orientation angles, ς_ψstar (right), against the mean values of the total polarized flux from the Planck 353 GHz observations in all the 10′ vicinities with more than three stars towards each observed region. The dashed gray lines, included just for reference, correspond to (left) and ς_ψstar = 10° (right).