Spitzer-IRAC image at 8 μm of MSXG52. The blue and red contours represent the ¹²CO J = 3−2 emission averaged from 36 to 42 km s^-1 (blue lobe), and from 48 to 51 km s^-1 (red lobe), respectively. The blue contours are at 0.10, 0.12, 0.14, 0.16, and 0.18 K and the red ones are at 0.10, 0.12, 0.13, 0.14, 0.20, 0.30 K. We show the spectra toward the center of features B1, R1, and R2. The green cross indicates the location of MSXG52. The green box shows the area mapped with ASTE at this transition. The green circle represents the beam of the molecular observations.