Direction of the magnetic field (left panel), the mean angle of the magnetic field (middle panel), and the rms of the magnetic field direction (right panel). Maps in the middle and right panels have been made using a 12 × 12 pixels sliding window with weight inversely proportional to the measured uncertainty variance. All maps have been regridded to match the grid size of the CN and HCO⁺ data. The gray contour indicates the mask we defined for dust polarization measurements, described in Sect. 2.1.