Table 10: H2 volume densities and N2H+ and N2D+ column densities, derived in the LVG approximation.
  N2H+   N2D+
Source $n_{\rm H_2}$ $N({\rm N_2H^+})$   $n_{\rm H_2}$ $N({\rm N_2D^+})$
  ( $\times 10^{6}$ cm-3) ( $\times 10^{13}$ cm-2)   ( $\times 10^{6}$ cm-3) ( $\times 10^{11}$ cm-2)
05345+3157 2.4 3.2   8.0 8.6
05373+2349 2.8 5.0   9.0 6.7
18144+3157 1.6 11   - -
18511+0146 1.0 3.9   - -
18517+0437 1.7 3.5   - -
19092+0841 1.3 7.2   - -
20126+4104 2.6 8.6   6.4 8.0
20216+4107 1.5 1.1   1.0 6.0
20343+4129a 0.4 4.0   3.0 2.9
20343+4129b 1.0 9.6   6.0 30
22172+5549 4.0 1.4   - -
a Peak at (-8 $^{\prime\prime}$, 4 $^{\prime\prime}$). b Peak at (13 $^{\prime\prime}$, 0 $^{\prime\prime}$).

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