Fig. 4

Bottom: 13CO J = 2–1 and 5–4 emission detected towards HH377. The dashed lines (in blue) mark the peak velocity of the cloud emission (v = −10.9 km s-1); we have indicated the observatory and the telescope HPBW in arcsec on the top right hand side. Top: intensity line ratio of 13CO/12CO J = 2–1 and 5–4 as a function of velocity, between −70 and +5 km s-1.
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