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Fig. 2.

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Observed lines of HC3HCN in TMC-1 from the QUIJOTE line survey (black histogram) and synthetic spectra (red curve) calculated adopting a column density of 2.2  ×  1011 cm−2. Blanked channels correspond to negative features produced in the folding of the frequency-switching data. For each rotational transition, the most intense hyperfine components are shown. The abscissa corresponds to the rest frequency assuming a local standard of rest velocity of 5.83 km s−1. The ordinate is the antenna temperature in millikelvins.

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