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Fig. 3

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Left: 13CO (top) and C18O 2–1 (bottom) spectra integrated within a 1″ box around the continuum position. Right: single-dish spectra of 13CO 3–2 (except for L1536, which is 13CO 2–1) and C18O 2–1. The vertical red dotted lines indicate the systemic velocities of each source derived from single dish C18O and C17O data (Yıldız et al. 2013). The horizontal blue lines indicate the spectral σrms.

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