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Fig. 9

image

Predicted brightness temperature ratio of 12CO(4–3)/12CO(3–2) by RADEX for the same models that are presented in Fig. 8. It confirms the need for high temperatures (> 50 K) and densities (5–7 × 103 cm−3) to reach the observed excitation of 12CO(4–3). The black horizontal line indicates the average observed ratio towards Musca, and the grey area indicates the standard deviation.

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