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Fig. 10


12CO(4–3)/12CO(2–1) integrated brightness ratio (black) for J-type shock models from the Paris-Durham code. The ratio at a shock velocity of 4 km s−1 is higher than observed in Musca. This is expected because the ratio decreases towards lower velocities and the 12CO(2–1) emission in Musca also comes from non shocked gas, such that the observed ratio is a lower limit for the shock models. In red, we show the integrated brightness of 12CO(4–3) for the same shock models, together with the 12CO(4–3) integrated brightness interval of the blueshifted component in Musca. The observed values in Musca show a relatively good agreement with the predicted 12CO(4–3) integrated brightness for a pre-shock density of ~ 5 × 102 cm−3.

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