Fig. 16
12CO/13CO abundance ratio plotted against N(12CO). The shaded rectangle shows the ranges of values from RADEX fits (ΔV = 20 km s-1) of NGC 1140. The solid line corresponds to the models of the 12CO/13CO abundance ratio vs. the 12CO column density by Szűcs et al. (2014). The error bars for these models (vertical black lines) are (very roughly) estimated from their Fig. 8.
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