Comparison of LTE analysis predicted column density ranges of DCN/HCN to models shown in Roueff et al. (2007) and Bayet et al. (2010). The term ‘SB’ stands for starburst, ‘SB+’ for cosmic-ray enhanced starburst, ‘NS’ for normal spiral, ‘LM’ for low metallicity, ‘HZ’ for high redshift, and ‘WC’ for warm core. The ‘LT’ (lower temperature) prefix is given to the models from Roueff et al. (2007), as these models were conducted at a significantly lower kinetic temperature (70 K) than the remaining models from Bayet et al. (2010) (> 300 K). The effect of this temperature difference is discussed in the text. The primordial D/H ratio of around 2.55 ± (0.03)×10⁻⁵ is presented with a horizontal dashed line (Zavarygin et al. 2018).