Polarization angles showing the magnetic field direction from observations (red) and the best model (blue: b₀ = 0.1, λ = 2.66, , and ). The gray-scale map shows the polarized intensity, P, while black contours show the 1.3 mm dust emission at 5, 10, 15, 20, 40, 80, 160, and 300 times σ, (see Fig. 1 for details). We note that although the magnetic field segments of the observations are shown also for regions below the 5σ contour, these have not been used for the calculations or the discussion.