Fig. 18
Observed HCO+ 4–3/H13CO+ 4–3 ratio of the peak intensities for the range of +5 to +9 km s-1. The observed ratio takes values between 6 and 37, which is lower than the optically thin ratio of 60 and indicates that the main isotope HCO+ 4−3 is optically thick throughout the cloud. The effect is stronger toward the three embedded objects.
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