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Fig. 4
Line profiles of CO 1−0 (black line), CO 2−1 (gray line), 13CO 1−0 (blue line), and C18O 1−0 (red line) toward IRS 1 as observed with IRAM (offset position: 0′′, –4.0′′). Wings are visible at blueshifted velocities. The dashed vertical line represents the velocity of the source (–7.1 km s-1).
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