Fig. 3.
Left: HCN/HC15N and HCN/H13CN isotopic ratios in each Keplerian channel derived from the spatially averaged procedure (see Sect. 3.1). The colored bands indicate the average value ±1σ. The spatially averaged CN/C15N ratio from Paper I is shown as a hatched rectangle. Right: radial dependence (see Sect. 3.2) of the HCN/H13CN and HCN/HC15N ratios. Each box is 5 au wide (one-third of the HPBW) and ±1σ in height. The full line shows the best fit of a power law to the 15N ratio, with a slope of 1.3. The gray shaded areas are the present-day 14N/15N and 12C/13C elemental ratios in the local ISM (330 ± 30 (Paper I) and 65 ± 10 Halfen et al. 2017, respectively).
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