Magnetic field structure of filament G37 revealed with VGT measurements of ¹²CO. The orientation of the magnetic field is represented as black vectors. The intensity map of filament G37, derived from ¹³CO emission, is depicted as white contours (same as Fig. 1). The background of the image corresponds to a mid-infrared three-color map, consistent with Fig. 1. The spatial resolution of the magnetic field measurement using VGT is ~2ʹ, as indicated by a white circle in the bottom-right corner.