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Fig. 2
Same as Fig. 1 for the 13CO J = 1 → 0 line. Spectra from IRAS 16552-3050 and OH12.8-0.9 correspond to the WILMA autocorrelator. Spectra corresponding to IRAS 18113-2503 and IRAS 19134+2131 have been smoothed to three times the original velocity spacing.
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