Predictions of the HC3N/HC5N abundance ratio from the chemical models described in Sect. 3.2 for ζ = 1 × 10-17 at the five different times (from top to bottom): 1 × 104 yr, 3 × 104 yr, 1 × 105 yr, 3 × 105 yr, and 1 × 106 yr. All symbols used (contour plots, grey zone, etc.) are the same as in Fig. 3.
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