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Fig. 11

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13CO (red), CO v = 2–1 (green) and v = 3–2 (blue) line are plotted on top of the CO v = 1–0 lines (black) for the broad-based single peaked CO emitting sample of T Tauri stars. Dashed lines indicate that the line profile is constructed by stacked lines that all are to some degree affected by line overlap. All profles have been normalized to a peak flux of unity.

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