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Fig. 4


Comparison of the opacities of the individual velocity channels for the CCH (15/2,5/2−03/2,3/2) and c-C3H2 (21,2−10,1) lines. The straight line shows the mean ratio τ(CCH)/τ(c-C3H2) = 1.8. The typical error on the opacities in each velocity channel is about  ~0.1.

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