Multi-wavelength polarimetry toward Pipe-109: in the lower panel, optical (light grey), near-IR (grey), and submm (black) polarization vectors are plotted over the visual extinction map of Román-Zúñiga et al. (2010). The vectors are scaled to the same size. The white contours are the 870 μm dust continuum emission detected by PolKa. The contours are 10, 20, 30, 40, and 50 times the rms of the map (~5 mJy beam^-1). The submm vectors are rotated by 90° to show the magnetic field direction. The dependence of the polarization degree and polarization angle of the three wavelengths with respect to the visual extinction is shown at the upper panels. Light grey and grey squares refer to the optical and near-IR data, respectively. Filled black squares and open squares refer to the submm data at P/σ_P> 3 and 2, respectively.