Fig. 3.
Observed and calculated abundance ratios [MH+]/[M] in cold dense clouds as a function of the proton affinity of the neutral M. They are based on Agúndez et al. (2015b), with updates for H2COH+ from Bacmann et al. (2016), for H2NCO+ from Marcelino et al. (2018), for HC5NH+ from Marcelino (2020), and for HC3O+ from this study.
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