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Fig. 1

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Selection of the spectra observed towards the pre-stellar core L1544 (black) and the protostellar core HH211 (red). The dotted vertical lines indicate the respective rest velocities of the cores. For HCN, the F = 2–1 transition is shown. For CCH, C13CH CCD H13CN and DCN, the transitions listed in Table 1 are shown.

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