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Fig. 6

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Steady-state abundance of NS and N2H+ from our grids of models (top: n4 = 1; bottom: n4 = 10) are compared to the observational estimates listed in Table 2. The value of n4, ζ17, and the ratioζ17n4 are indicated in each panel. Five values of Sgas (see Table 3) are associated with each C/O ratio.

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