Fig. 2
Single-dish CO isotopologue spectra of HD 101584 at 2 km s−1 resolution. Left panels: CO 1–0, 2–1, 3–2, 4–3, and 6–5 spectra from top to bottom. Middle left panel: 13CO 1–0, 2–1, and 3–2 spectra from top to bottom. Middle right panel: C17O 2–1spectrum. Right panel: C18O 2–1spectrum. We note that the emission at the velocity extremes in the CO 4–3 and 6–5 lines my be suppressed by up to ≈20 and 50%, respectively, due to the relative sizes of the source and the beam (the beam is always pointed towards the centre of the source).
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