Fig. 4.
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Column densities in TMC-1 for monocyanopolyynes (in green) and dicyanopolyynes (in blue), and their protonated forms. Observed column densities are taken from Agúndez et al. (2015), Cernicharo et al. (2020a), Marcelino et al. (2020), Cabezas et al. (2022b), and this work. The column densities of NCCN and NC4N were estimated from those of NCCNH+ and NC4NH+, respectively, assuming a protonated-to-neutral abundance ratio of 10−3 (see text).
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