Plot adopted from Fig. 2 in Lada et al. (2012). The red points represent the position of the star formation rate and the total mass of the entire CNC. The error in the log (M) is 0.1 (i.e. ~30% of the total mass), and the error in log (SFR) is 0.2 (i.e. ~50% of the star formation rate). The empty points represent the cloud mass computed over an extinction threshold of AK > 0.1 and the filled point over AK > 0.8 (as in Lada et al. 2012). three parallel lines correspond to fDG = 1.0, 0.1, and 0.01 (defined in Eq. (3)) from left to right, respectively.
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