Line ratio (a), (b), (c), and (d) distribution of the observed region. The overlaid contours are 13CO (3–2) integrated intensities, which start from 0.9 K km s−1 (6σ) and increase by 0.9 K km s−1. The beam sizes are shown in the lower left corner of panel a. In all panels, the (0, 0) offset corresponds to αJ2000 = 22h18m00s.44, δJ2000 = 61°49′03.′′7. In panels c and d, the cross represents the peak position of region C2 that is analyzed in Fig. 13.
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