Radial profile of the degree of polarisation for different values of the flaring parameter β (upper left), the scale height h_ref (middle left), the viscosity parameter α (lower left), and the exponent of the grain size distributions (upper and lower right). The shaded areas coincide with the radial distance of the transition from optically thick to optically thin. For details, see Fig. 4. Middle right: radial profile of the normalised total flux for different grain size distributions at λ = 350 μm.