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Fig. 5

image

CN spectra taken at three different positions: the geometric centre (black), the southern edge (blue), and the northern edge of the circumbinary disc (red; see white crosses in the moment 0 map of CS in Fig. 2). The dashed green vertical lines represent the rest frequency of the CN hyperfine transitions (see Table 3), while the dashed grey horizontal line shows the value of 3σ.

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