Fig. 8
Diagnostic plots of the ratios of [C ii], CO and the FIR continuum for M 33 and for four other types of objects, low-metallicity systems, normal galaxies, Milky Way star-forming regions, and GMCs. Upper panel: [C ii]/CO 1−0 vs. [C ii]/FIR. Bottom panel: FIR/CO 1−0 vs. [C ii]/CO 1−0. All panels are shown on a logarithmic scale. Symbols used have the same meaning than those used in Fig. 7.
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