Table 9: N2H+ and N2D+ total column densities ( $N({\rm N_2H^+})$ and $N({\rm N_2D^+})$), deuterium fractionation ( $D_{\rm frac}$), and N2H+ chemical abundance relative to H2( $X_{\rm N_2H^+}$). $X_{\rm N_2H^+}$ has been calculated from the molecular hydrogen column density given in Col. 8 of Table 8.
Source $N({\rm N_2H^+})$ $N({\rm N_2D^+})$ $D_{\rm frac}$ $X_{\rm N_2H^+}$
  ( $\times 10^{13}$ cm-2) ( $\times 10^{11}$ cm-2)   ( $\times 10^{-10}$)
05345+3157 3.14 $\pm$ 0.07 3.2 $\pm$ 0.9 0.010 $\pm$ 0.007 1.5
05373+2349 4.34 $\pm$ 0.06 2.8 $\pm$ 0.8 0.006 $\pm$ 0.001 1.9
18144+3157 9.75 $\pm$ 0.08 $\leq$4.8 $\leq$0.004 2.1
18511+0146 6.47 $\pm$ 0.01 2.5 $\pm$ 0.4 0.004 $\pm$ 0.001 5.0
18517+0437 6.48 $\pm$ 0.02 $\leq$6.7 $\leq$0.01 8.1
19092+0841 1.9 $\pm$ 0.5 $\leq$5.3 $\leq$0.028 0.7
20126+4104 7.62 $\pm$ 0.01 4.9 $\pm$ 0.7 0.006 $\pm$ 0.001 0.8
20216+4107 1.4 $\pm$ 0.2 2.8 $\pm$ 0.5 0.020 $\pm$ 0.007 0.8
20343+4129a 2.2 $\pm$ 0.1 4.4 $\pm$ 0.7 0.020 $\pm$ 0.005 0.4
20343+4129b 2.9 $\pm$ 0.1 5.4 $\pm$ 0.8 0.02 $\pm$ 0.01 0.5
22172+5549 1.226 $\pm$ 0.006 2.1 $\pm$ 0.4 0.017 $\pm$ 0.004 0.4
a Peak at (-8 $^{\prime\prime}$, 4 $^{\prime\prime}$). b Peak at (13 $^{\prime\prime}$, 0 $^{\prime\prime}$).

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