Gaussian fit of a broad and a narrow component of CS 7−6 toward IRAS 4A, IRAS 4B, and IRAS 4C (bottom to top). Dense gas tracers such as CS 7−6 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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