Maps of the 13CO (top) and C18O (bottom) abundances. The coloured lines correspond to xCyO 2–1 (blue), 3–2 (light blue), and 6–5 (white), respectively. The solid lines denote where 25% and 75% of the emission is produced. the dashed lines. The dashed lines show the τ = 1 surface for the line emission. The dash-dotted lines show the τ = 1 surface for the continuum at the wavelength of the line.
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