Magnetic field orientation in the NE region. Colored dots, triangles, and squares give the absolute positions of the 22 GHz water masers belonging to three distinct DW streamlines, respectively, the NE-1, NE-2, and NE-3 streamlines. The method employed to divide the maser spots of the NE region into three distinct streamlines is described in “Resolving the NE emission into three distinct streams” in the Supplementary Information of Moscadelli et al. (2022). Colors denote the maser V_LSR. The black, red, and blue dashed curves are the sinusoids corresponding to the plane-of-the-sky projection of the NE-1, NE-2, and NE-3 helical streamlines. The segments indicate the PA of the (sky-projected) direction of the magnetic field for the water masers detected in polarized emission (see Table 1), using black or red color if the LOS inclination of the magnetic field is less or more than 55°, respectively.