Panel a: map of the excitation temperature with a linear scale in units of K from the 12CO (J = 1−0) emission in the 52–64 km s-1 interval. Panel b: map of the optical depths of 13CO (J = 1−0). Panel c: map of the column density in units of 1021 cm-2. The blue contours represent the 13CO (J = 1−0) emission map.
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