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Fig. 1

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Part of the VLT-CRIRES spectrum of AS 205 A. The strong 12CO lines are labelled with their R-band lower J-transition number and the other marked lines show detections of 12CO v = 2–1, v = 3–2, 13CO, and the Pfund-β line. The gaps in the spectrum are excised telluric features. For other parts of the AS 205 A spectrum, these gaps have been filled in by observations at different times of the year (see Fig. 2).

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