Fig. 2
Integrated C18O 2–1 emission for each of the protostars shown as contours on top of continuum maps of each source. The contours are shown at steps corresponding to 20%, 30%, 40%, etc., of the peak emission in the integrated line maps. The dashed lines indicate the outflow axis from SMA 12CO 2–1 maps for the sources where this line was observed simultaneously with C18O 2–1.
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