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Fig. 14

From top to bottom: (1) total far-IR line cooling; (2) ratio of molecular to atomic cooling; (3) gas-to-dust cooling ratio, LFIRL/Lbol, where LFIRL = Lmol + Latom; as a function of bolometric luminosity. Low-mass YSOs are shown in red (Class 0) and blue (Class I), whereas high-mass ones are in black.
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