Polarization vectors rotated by 90° showing the plane-of-sky magnetic field configuration at Band 7. Contours show the same Stokes I intensity levels as in Fig. 1. The background image is a moment 1 map of the H₂ CO (3_2,1 − 2_2,0) emission in BHB07-11. The moment map is produced from a 3σ cut (σ ~ 5.3 mJy beam⁻¹) in the molecular emission. The synthesized beam of the H₂CO map is 0.27′′ × 0.21′′. The stars symbols have the same meaning as in Fig. 1.