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Fig. 1

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On source CO spectra convolved to a ~20′′ beam. From left to right: 12CO 3–2, 10–9, 13CO 10–9, C18O 9–8, 5–4 and 10–9, respectively. Only the CO 3–2 lines are observed with the JCMT, the rest of the data are from Herschel-HIFI. The spectra are plotted by shifting the source velocity (Vlsr) to 0 km s-1 (actual source velocities are given in Table 4). The lines are shifted vertically. Intensity scale of some sources is multiplied by a constant value for easy viewing and marked if different from 1. The top half of the figure shows the Class 0 sources whereas the bottom part displays the Class I sources. The right-most column displays the C18O 5–4 and C18O 10–9 lines for the Class 0 sources only. The latter lines are very close to the H2O 312–303 line resulting in an intensity rise on the blue side of the spectrum in some sources.

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