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Fig. 1.


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Spectra of (a) CO (7 − 6) + [CI] (2 − 1), (b) CO (5 − 4), and (c) [CI] (1 − 0) emission of D49. The binned step width is ∼90 km s−1 in panels (a) and (c) and ∼40 km s−1 in panel (b). The red curves indicate the fitted Gaussian profiles combined with a power-law dust continuum, the latter shown by a dashed line. The blue and green shaded areas in panel (c) indicate the 1σv and ±3σv velocity width used to set the upper limit on [CI] (1 − 0).

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