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Fig. 7


Gaussian fit of a broad and a narrow component of CS 76 toward IRAS 4A, IRAS 4B, and IRAS 4C (bottom to top). Dense gas tracers such as CS 76 do not show absorption, but do show differences in line widths and strengths between the Class 0 objects IRAS 4A, IRAS 4B, and the IRAS 4C (single component).

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