Fig. A.2.
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Spectra of H13CN (J, F = 1 2 - 0 1) in black and HC15N (N= 1-0) in red extracted in the regions shown as black circles in the left panel in Figure 3. The values in boldface report the 14N/15N ratio in HCN for each set of spectra derived using the 12C/13C ratio of 68 (Milam et al. 2005). We note the sharp decrease in the H13CN line towards the south, when compared to the almost constant HC15N.
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