Fieldorientation on the POL-2 850 μm intensity map (panel a), polarisation fraction p_mas (panel b), and polarisation angle dispersion function S(δ = 20′′; panel c) calculated from data at 40′′ resolution. Polarisation vectors (at 20′′ steps, rotated to show the magnetic field orientation) and S are shown for pixels with N(H₂) > 5 × 10²¹ cm⁻². The length of the polarisation vectors per cm is the same as in Fig. 10 (14.4′′ for a polarisation fraction of 1%). The yellow contours correspond to N(H₂) = 10²² cm⁻², outside of which polarisation angles are uncertain.