Composite H2O 110–101, CO 10–9 and CO 3–2 spectra of Class 0 and Class I sources averaged in order to compare the line profiles of two types of sources. All spectra are rescaled to a common distance of 200 pc, shifted to the central 0 km s-1 velocity, rebinned to a 0.3 km s-1 velocity resolution. The CO spectra refer to a 20′′ beam, the H2O spectra to a 40′′ beam. The red spectra overlaid on top of the 12CO 10–9 are obtained by normalizing all the spectra to a common peak temperature first and then averaging them.
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