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Table 4

List of CO isotopologues and the 12CO v = 2–1, v = 3–2 and v = 4–3 lines.

Sourcea 12CO 13CO CO v = 2–1 CO v = 3–2 CO v = 4–3 C18O

AS 205 A x x x x x x
DR Tau x x x x x x
RU Lup x x x x - -
S CrA A x, a x x x x x
S CrA B x, a x x x - -
VV CrA A x, a x, a x x x a
VW Cha x a x - - -
VZ Cha x - x x - -

x = detection in emission, a = detection in absorption and - = no detection.

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