Fig. B.1
Spectra of C18O (2–1) at the continuum peak position (top) and at the main (middle) and secondary peaks (bottom) of N2H+ emission. The top and middle spectra are shifted vertically for clarity. The dashed lines indicate the velocity interval used for computing the integrated intensity. The dotted line shows the 3σ level (1σ = 3.0 mJy beam−1).
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