Table 3: Line parameters of the N2H+ and N2D+ lines.
  N2H+ (1-0)   N2D+
Source W $\Delta v$ $\tau$ $T_{\rm ex}$ $T_{\rm Kin}$ WJ=1-0 WJ=2-1 WJ=3-2 $\tau$ $ \Delta v_{2-1}$ $T_{\rm ex}$
  [K km s-1] [km s-1]   [K] [K] [K km s-1] [K km s-1] [K km s-1] J=2-1 [km s-1] [K]
L 1448 IRS 2 12.93 0.50 11.6 6.8 - 1.7 1.10 0.73 <0.1 0.53 -
L 1448 IRS 3 24.65 0.93 4.1 11.4 12.0 4.0 5.05 3.22 2.6 0.59 7.9
L 1448 C 12.48 0.76 5.3 7.3 13.7* <1 2.32 1.38 <0.1 0.72 -
L 1455 A1 7.20 0.74 1.4 9.2 15.0 <1 0.68 <0.74 <0.1 0.42 -
L 1455 A2 8.60 0.54 3.0 9.1 11.0 <1 1.03 <0.73 <0.1 0.33 -
Per 4 S 5.08 0.29 3.5 8.5 9.0 1.3 1.43 0.98 <0.1 0.32 -
Per 4 N 4.62 0.31 3.6 7.6 10.0 1.3 0.75 <0.68 <0.1 0.31 -
Per 5 7.53 0.38 3.8 8.7 11.0 <1 1.07 1.08 <0.1 0.36 -
Per 6 4.64 0.36 <0.1 - 11.0 <1 <0.18 <0.69 - - -
IRAS 03282 9.53 0.38 5.3 8.6 11.3* <1 3.58 1.47 3.9 0.34 7.9
Barnard 1-B 19.05 0.82 8.6 7.6 12.0 5.9 7.48 4.82 4.9 0.78 6.7
HH 211 9.18 0.41 6.2 7.6 12.8* 2.3 5.24 2.08 4.9 0.39 7.5
Barnard 5 IRS 1 8.59 0.43 6.4 7.2 10.8* <1 0.50 0.65 <0.1 0.50 -
L 1527 3.91 0.32 5.6 5.7 10.8* <1 <0.18 <0.59 - - -
L 483 14.05 0.44 12.1 7.3 10.0 2.1 1.75 1.13 2.8 0.37 5.5
SMM 5 15.39 0.70 4.9 8.9 12.0 <1 2.46 1.43 <0.1 0.58 -
L 723 5.70 0.71 2.4 6.6 11.0 <1 0.34 1.29 <0.1 0.32 -
L 673 A 7.34 0.54 2.9 8.6 <12.0 <1 0.45 0.63 <0.1 0.34 -
B 335 6.05 0.40 9.0 5.7 9.9 <1 0.42 0.42 <0.1 0.46 -
L 1157 8.38 0.65 2.1 8.9 - <1 0.53 1.00 <0.1 0.56 -
The kinetic gas temperatures marked with an * are taken from Hatchell (2003). All other $T_{\rm kin}$ values are listed in Jijina et al. (1999). The errors on the integrated intensities of N2H+ 1-0 and N2D+ 2-1 are $\sim$$10\%$ (calibration uncertainties), whereas the errors on the N2D+ 1-0 and N2D+ 3-2 lines are dominated by the noise of the spectra (0.5 and 0.2 K km s-1 for J=1-0 and J=3-2, respectively). $\tau$ is the total optical depth, defined as the sum of the optical depths of the individual hyperfine components. Typical errors of $\tau$ are $\pm$0.5 and $\pm$0.2 for N2H+ and N2D+ 2-1 (where it is detected), respectively. The resulting error of $T_{\rm ex}$ is $\sim$0.2 K for both species.

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