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Fig. 6


Top: CO 6–5 line luminosity vs. Lbol. Middle: 13CO 6–5 line luminosity vs. Lbol. Bottom: [CI] 3P23P1 line luminosity vs. Lbol. Fits to the line luminosities are shown in red, with the slope labeled “γ”. The slopes are within the error bars of San Jose-Garcia et al. (2013). Open symbols are the low-mass sample from Yıldız et al. (2013). No [CI] was reported in Yıldız et al. (2013). The [CI] detections of van Kempen et al. (2009a) are included.

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