Table 2: Line parameters derived from hyperfine structure fitting at position (-10, 0). The values refer to spatially averaged spectra (26 $^{\prime \prime }$ beam).
Line $V_{\rm LSR}$ $\Delta V$ $\tau$ $\int T_{{\rm MB}}{\rm d}V ^b$ $T_{\rm ex}$

km s^-1 km s^-1 K km s^-1 K

${\rm N}_2{\rm H}^+$ (1-0) 6.472 $\pm$ 0.001 0.299 $\pm$ 0.001 17.9 $\pm$ 0.1 5.859 $\pm$ 0.016 4.94 $\pm$ 0.03

${\rm N}_2{\rm H}^+$ (3-2) 6.388 $\pm$ 0.010^a 0.290 $\pm$ 0.030 1.4 $\pm$ 1.0 0.692 $\pm$ 0.075 5.1 $\pm$ 3.7

${\rm N}_2{\rm D}^+$ (2-1) 6.505 $\pm$ 0.004 0.268 $\pm$ 0.010 2.2 $\pm$ 0.4 0.978 $\pm$ 0.026 4.6 $\pm$ 0.9

${\rm N}_2{\rm D}^+$ (3-2) 6.507 $\pm$ 0.006 0.222 $\pm$ 0.024 1.2 $\pm$ 0.9 0.332 $\pm$ 0.029 4.1 $\pm$ 3.2

NOTE: ^a The ${\rm N}_2{\rm H}^+$ (3-2) frequency is as in Caselli et al. (2002a), whereas for the other lines
we used the updated values determined by Dore et al. (2004).
^b The integration includes all hyperfines.

**Table 2:** Line parameters derived from hyperfine structure fitting at position (-10, 0). The values refer to spatially averaged spectra (26 $^{\prime \prime }$ beam).
Line	$V_{\rm LSR}$	$\Delta V$	$\tau$	$\int T_{{\rm MB}}{\rm d}V ^b$	$T_{\rm ex}$
	km s^-1	km s^-1		K km s^-1	K
${\rm N}_2{\rm H}^+$ (1-0)	6.472 $\pm$ 0.001	0.299 $\pm$ 0.001	17.9 $\pm$ 0.1	5.859 $\pm$ 0.016	4.94 $\pm$ 0.03
${\rm N}_2{\rm H}^+$ (3-2)	6.388 $\pm$ 0.010^a	0.290 $\pm$ 0.030	1.4 $\pm$ 1.0	0.692 $\pm$ 0.075	5.1 $\pm$ 3.7
${\rm N}_2{\rm D}^+$ (2-1)	6.505 $\pm$ 0.004	0.268 $\pm$ 0.010	2.2 $\pm$ 0.4	0.978 $\pm$ 0.026	4.6 $\pm$ 0.9
${\rm N}_2{\rm D}^+$ (3-2)	6.507 $\pm$ 0.006	0.222 $\pm$ 0.024	1.2 $\pm$ 0.9	0.332 $\pm$ 0.029	4.1 $\pm$ 3.2

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