Large-scale magnetic field (red segments) traced by PLANCK 353 GHz continuum polarization. The PLANCK polarization data have a beam size of 5′, and the segments are plotted per 1/3 beam. The filled colored points represent the relative orientations between the large- and small-scale magnetic field. The large parsec-scale magnetic field reveals a converging pattern pointing toward SDC13. The relative orientations show a spatially asymmetric distribution with respect to SDC13, i.e., the small-scale magnetic field is perpendicular to the large-scale magnetic field in the south of SDC13, and tends to be more parallel to the large-scale magnetic field in the north.