OMC-3 polarization maps at different scales. Left: total intensity is shown with overlaid polarization vectors in blue. The length of the vectors is proportional to the polarization degree and the direction gives the orientation of the linear polarization. Right: total intensity, observed at 1.2 mm with ALMA, is shown with overlaid polarization vectors in blue. Red polarization vectors are oberserved with JVLA at 9 mm (Liu 2021, ©AAS. Reproduced with permission).