Fig. A.2.

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Observed lines of HCCCN towards TMC-1 (CP) at 3 mm (histogram black spectra). The blue histogram spectra show the data divided by a factor of 20, 20, 30, 40, and 40, from top to bottom. The red curves show the synthetic spectra obtained using the LVG approximation (see Sect. 3.1 and Table A.5). The magenta curves show the synthetic spectra divided by the same factors as above.
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