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Fig. 4
Same as Figs. 1–3 for the 13CO J = 2 → 1 line. The sources IRAS 16552-3050 and OH 12.8-0.9 have not been observed in this transition. Spectra corresponding to IRAS 18113-2503 and IRAS 19134+2131 have been smoothed to three times the original velocity spacing.
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