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Fig. 4


(a) PV diagram of 12CO (1–0) along the crest of F1 as indicated in Fig. 3f. The overlaid contours represent the PV diagram of 13CO (1–0). The contours start at 0.9 K (3σ) and increase by 0.9 K. The offsets are given with respect to the southwestern end of the PV cut. The systemic velocities of L1188a and L1188b are indicated by two blue vertical dashed lines. (b) Similar to a, but for 12CO (2–1). (c) Similar to a, but for 12CO (3–2). In panels b–c, the bridging features are indicated by the green dashed boxes. (d) Normalized integrated intensities of 12CO (2–1) (blue points) and 12CO (3–2) (red points) as a function of the offsets in the crest of F1. The offsets are calculated with respect to the southwestern end of F1.

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