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Fig. 4


Top: 12CO(4–3) spectra overlaid on the Herschel dust temperature map. The (0,0) position of the map is α2000 = 12h 28m58s, δ2000 = − 71°16′55′′ Middle: 12CO(4–3) spectra overlaid on the northern Herschel column density map. The white contours indicate Musca filament crest (N > 3 × 1021 cm−2). The black squares indicate the locations of the spectra displayed below. Below: zoom into spectra at selected positions in the map. This shows that there is 12CO(4–3) and 12CO(3–2) emission at the velocity of the blueshifted component over the full map.

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