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Fig. 13

Ratios of the CO 10–9/3–2 line wings for 14 protostars as function of velocity offset from the central emission. Spectra are shifted to Vlsr = 0 km s-1. The wings start at ±2.5 km s-1 from Vlsr in order to prevent adding the central self-absorption feature in the CO 3–2 lines.
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