Predicted contribution to the integrated line intensity (dF/ dr ∗ r) of a shell at a radius r for the HC3N lines. This model corresponds to α = 0, Tjump = 80 K, Xin = 3.6 × 10-10, and Xout = 6.0 × 10-11. The three upper red dashed curves show an increasing emission towards the maximum radius and very likely contaminated by the molecular cloud (see Sect. 4.2.1).
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