Top: the spectral and spatial distribution of N2H+ (1−0) emission associated with leaf #9. The left-hand panel is a spatially averaged spectrum, showing the isolated (F1, F = 0, 1 → 1, 2) hyperfine component of N2H+ (1−0). The spectrum has been extracted from the black dashed box seen in the centre and right-hand panels. Two spectral components are clearly evident. The solid black and orange Gaussian profiles represent the best-fitting model solution to the data (the orange line refers to the component most closely associated with the leaf extracted from the 3.2 mm continuum data). The centre and right-hand panels display the spatial distribution of each emission feature. The plots are shown on an equivalent scale for ease of comparison, however, this has led to saturation in both central panels. The black contours are equivalent to those in Fig. 1 and the orange contour corresponds to the boundary of leaf #9. Bottom: each panel is equivalent to those shown in the top panels but for leaf #5. Note how the northern and southern portions of the dendrogram leaf appear to be attributed to two independent velocity components which overlap spatially. The black Gaussian profiles reflect the fact that the continuum flux accredited to leaf #5 cannot be attributed to a single structure (see text for details regarding the treatment of such cases).
