Fig. 8
13CO ratio stacked histogram including JCMT and Herschel data from Yıldız et al. (2013; top row) and this work (bottom row). Upper limits are shown in gray. Ratios from Yıldız et al. (2013) are for the systems in the Water In Star-forming regions with Herschel (WISH) key project (van Dishoeck et al. 2011), which do not overlap with the sample studied in this work. The black dashed line shows a Gaussian distribution fit to the total sample of 13CO ratios.
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