Fig. 2
APEX single pointing observations of DCO+, DCN, SO, CH3OH, and HNC. Except for DCO+ 3–2 and HNC, the spectra are multiplied by a factor of 3 to make the features more prominent. The spectra for the wide multiple systems are averaged for all the sources, except for NGC 1333 IRAS 5. The vertical blue line marks the systemic velocity.
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