Histograms of the linear polarisation fraction (top) and angular dispersion function (bottom) for the Auriga 6 model and the observer at the low density position in the outer annulus. Only pixels in the thin disc with |b| < 5°  are shown. The different colours correspond to different values of the alignment fraction f_S, A, as indicated in the legend. The full lines are the models that use dust allocation recipe recT12, while the shaded lines are the models with dust allocation recipe recSF8000. The black dashed lines are the corresponding Planck histograms.