Contour map of the optical extinction (thick lines) obtained with the NICER method overlaid on the Ks SOFI image. Contour levels are from 2 mag to 9 mag in steps of 1 mag.Contours of the C18O(2–1) integrated emission (0.8 K km s-1 to 2.4 K km s-1 in steps of 0.4 K km s-1) are shown with thin lines. The positional offsets are as in Fig. 9.
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