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Fig. 10


Observed (histograms) and modelled (red lines) spectra for a) N2H+ (J = 1 − 0) (top panel), and N2H+ (J = 3 − 2) (bottom panel). b) N2D+ (J = 1 − 0) (top panel), and N2D+ (J = 3 − 2) (bottom panel). c) N15NH+ (J = 1 − 0) (top panel), and 15NNH+ (J = 1 − 0) (bottom panel). The shaded areas correspond to the variations expected from the error bars set on the abundance profiles and represented in Fig. 5.

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