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Fig. 12

RADEX models for the four regions (see Fig. 11). The constraints on nH2 and Tkin from the various line ratios are indicated (solid lines) and their 3σ errors (dashed lines) for N(12CO) = 1 × 1016 cm-2 (left column) and for N(12CO) = 5 × 1018 cm-2 (right column).
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