Fig. 4
12CO 3–2 and 13CO 3–2 spectra of the central position of Elias 29 (left) and IRS 44 (right). The top figure shows the spectra, binned to 0.42 km s-1, the bottom figure shows the TMB ratio of 12CO 3–2/ 13CO 3–2 and the corresponding optical depth τ on the right axis. The dotted lines show the integration limits, indicating the velocities νin where the line wings start.
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