Fig. 15
Measured gap depth in units of σ over velocity. Gap detection with the optical thick 12C16O (3−2) transition (blue) is feasible, but only at the line edges (e.g., ± 700 m/s). In contrast, the less abundant 12C18O (3−2) transition (green) allows for gap detection at the line center. However, the CS (7−6) gives the most significant gap depth of about 17σ at ± 350 m/s.
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