Astronomy & Astrophysics

Table 2: N₂H⁺ and N₂D⁺ total column densities (N(N₂H⁺) and N(N₂D⁺)), deuterium fractionation ( $D_{\rm frac}$ ), linear diameter (L), and mass derived from N(N₂H⁺) ( $M_{\rm N_2H^+}$ ) for the N₂D⁺ condensations N and S of Fig. 1. The uncertainties computed following the standard propagation of the errors are given between parentheses.
Source $N({\rm N_2H^+})$ $N({\rm N_2D^+})$ $D_{\rm frac}$ L $M_{\rm N_2H^+}$

( $\times 10^{13}$ cm^-2) ( $\times 10^{12}$ cm^-2) (pc) ( $M_\odot$ )

N 1.9(0.6) 2.1(0.3) 0.11(0.04) 0.09 8.7

S 1.5(0.5) 1.6(0.3) 0.11(0.04) 0.05 2.5

**Table 2:** N₂H⁺ and N₂D⁺ total column densities (N(N₂H⁺) and N(N₂D⁺)), deuterium fractionation ( $D_{\rm frac}$ ), linear diameter (L), and mass derived from N(N₂H⁺) ( $M_{\rm N_2H^+}$ ) for the N₂D⁺ condensations N and S of Fig. 1. The uncertainties computed following the standard propagation of the errors are given between parentheses.
Source	$N({\rm N_2H^+})$	$N({\rm N_2D^+})$	$D_{\rm frac}$	L	$M_{\rm N_2H^+}$
	( $\times 10^{13}$ cm^-2)	( $\times 10^{12}$ cm^-2)		(pc)	( $M_\odot$ )
N	1.9(0.6)	2.1(0.3)	0.11(0.04)	0.09	8.7
S	1.5(0.5)	1.6(0.3)	0.11(0.04)	0.05	2.5

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