Table 2: Physical parameters.
Parameter Reg. 1 Reg. 2 Reg. 3 Reg. 4 Reg. 5 Reg. 6 Reg. 7 Reg. 8 Reg. 9 Reg. 10 Reg. 11 Reg. 12
  40 $.\!\!^{\prime\prime}$9 36 $.\!\!^{\prime\prime}$4 34 $.\!\!^{\prime\prime}$8 24 $.\!\!^{\prime\prime}$4 16 $.\!\!^{\prime\prime}$8 10 $.\!\!^{\prime\prime}$7 6 $.\!\!^{\prime\prime}$1 3 $.\!\!^{\prime\prime}$1 0 $^{\prime\prime}$ -3 $.\!\!^{\prime\prime}$1 -6 $.\!\!^{\prime\prime}$1 -9 $.\!\!^{\prime\prime}$1

$\frac{N({\rm O})}{N({\rm H})}\times 10^{4}$		 2.0 $\pm$ 1.8 2.2 $\pm$ 2.0 - 2.4 $\pm$ 0.5 3.1 $\pm$ 1.0 - 3.8 $\pm$ 1.5 5.1 $\pm$ 1.0 5.6 $\pm$ 0.6 5.6 $\pm$ 0.3 4.3 $\pm$ 0.4 2.8 $\pm$ 1.3

$\frac{N({\rm N})}{N({\rm H})}\times 10^{5}$		 - - - 1.4 $\pm$ 1.4 1.6 $\pm$ 1.6 - 1.9 $\pm$ 1 3.6 $\pm$ 1.8 3.6 $\pm$ 1.7 3.6 $\pm$ 1.7 2.9 $\pm$ 1.6 1.9 $\pm$ 1.7

$\frac{N({\rm N})}{N({\rm O})}$		 - - - 0.06 0.05 - 0.05 0.07 0.06 0.06 0.07 0.07

$T_{\rm e}$ (K)		 10100 9850 - 9180 8780 - 8185 7540 7370 7390 8000 9080

$N_{\rm e}(\frac{1}{\rm cm})^{3}$		 - - - - - - - 10 10 10 10 -

EW(H$\alpha $)(Å)		 2 $\pm$ 0.25 2 $\pm$ 0.25 2 $\pm$ 0.25 71$\pm$ 37 79 $\pm$ 28 56 $\pm$ 12 32 $\pm$ 11 90 $\pm$ 7 119 $\pm$ 8 92 $\pm$ 10 53 $\pm$ 7 39 $\pm$ 17

$V_{\rm HEL.}$(km s-1)		 3350 $\pm$ 18 3341 $\pm$ 28 3308 $\pm$ 16 3236 $\pm$ 40 3301 $\pm$ 34 3368 $\pm$ 40 3357 $\pm$ 24 3362 $\pm$ 28 3386 $\pm$ 16 3380 $\pm$ 18 3316 $\pm$ 18 3274 $\pm$ 36

Note: Distances are as in Table 1.

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