Dust extinction map of the Snake region in color scale at a spatial resolution of 20″ from Román-Zúñiga et al. (2010). All segments represent the B-field orientation. Blue and red segments are inferred from the optical and NIR data, respectively, with S/N≥3. The green segments show the magnetic field orientation from Planck data at the resolution of 10′. The vectors are scaled to the same size to enhance visualization clarity. The cyan contours represent the C¹⁸O (1-0) integrated intensity at levels of 0.8 K km/s and 1.6 K km/s.