Fig. 1
C18O 2–1 spectra towards the peak of the integrated emission of the observed sources. The integration intervals used for producing the moment-zero maps in Fig. 2 are indicated by vertical dotted lines and run from −2.5σ to 2.5σ of the fitted Gaussians (black dashed lines). The numeric value in the top left corner of each panel is the integrated emission over the line.
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