Fig. 8
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Column density ratios of acetone with respect to acetaldehyde (a), ketene (b), propanal (c), and propyne (d). In panel (b), the data points in lighter red refer to sources with less constrained column densities of ketene, of which the lines are blended with optically thick lines of CH2DOH and NH2CHO (see Sect. 3.2). Other denotations are the same as in Fig. 6.
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