Table 1: Dereddened line intensity ratios with respect to I(H$\beta $) = 100, reddening coefficient, observed H$\beta $ flux and physical conditions obtained from the optical spectra.
      SW arc NE blob
$\lambda_{\rm0}(\AA)$ Identification f($\lambda$) $\lambda_{\rm obs}(\AA)$ I($\lambda$)/I(H$\beta $) $\lambda_{\rm obs}(\AA)$ I($\lambda$)/I(H$\beta $)
4340.47 H$\gamma $ 0.135 4339.00 47.0 $\pm$ 2.5 4339.04 47.0 $\pm$ 3.9
4471.48 He I 0.10 4470.09 4.0 $\pm$ 0.8 ... ...
4861.33 H$\beta $ 0.00 4859.73 100 $\pm$ 2 4859.77 100 $\pm$ 2
4921.93 He I -0.01 4920.42 9.2: ... ...
4958.91 [O III] -0.02 4957.30 134.6 $\pm$ 3.8 4957.38 93.6 $\pm$ 2.7
5006.84 [O III] -0.03 5005.17 372.1 $\pm$ 8.3 5005.26 258.3 $\pm$ 5.8
5015.68 He I -0.03 5013.99 2.1 $\pm$ 0.4 5014.15 2.0 $\pm$ 0.4
5517.71 [Cl III] -0.17 ... ... 5516.19 0.8 $\pm$ 0.2
5537.88 [Cl III] -0.18 ... ... 5536.28 1.0 $\pm$ 0.2
5754.64 [N II] -0.21 5752.77 1.3 $\pm$ 0.2 5752.69 2.5 $\pm$ 0.1
5875.67 He I -0.23 5873.75 11.4 $\pm$ 0.4 5873.72 19.8 $\pm$ 0.6
6046.44 O I -0.26 ... ... 6044.87 2.5:
6300.30 [O I] -0.30 6298.55 0.9 $\pm$ 0.1 6298.50 2.4 $\pm$ 0.1
6312.10 [S III] -0.30 6310.38 1.8 $\pm$ 0.1 6310.27 2.4 $\pm$ 0.1
6363.78 [O I] -0.31 6362.32 0.2: 6361.96 0.7 $\pm$ 0.1
6571.36 Si II -0.31 ... ... 6370.07 2.9 0.7 $\pm$ 0.4
6548.03 [N II] -0.34 6546.10 18.5 $\pm$ 0.5 6546.02 26.4 $\pm$ 0.8
6562.82 H$\alpha$ -0.34 6560.85 286.0 $\pm$ 5.9 6560.74 286.0 $\pm$ 5.9
6583.41 [N II] -0.34 6581.41 59.4 $\pm$ 1.3 6581.32 59.4 $\pm$ 1.3
6678.15 He I -0.35 6676.08 3.8 $\pm$ 0.1 6676.00 3.8 $\pm$ 0.1
6716.47 [S II] -0.36 6714.33 2.1 $\pm$ 0.1 6714.05 2.1 $\pm$ 0.1
6730.85 [S II] -0.36 6728.76 3.8 $\pm$ 0.1 6728.46 3.8 $\pm$ 0.1
7001.92 O I -0.39 ... ... 6999.58 0.2:
7065.28 He I -0.40 7062.74 8.8 $\pm$ 0.3 7062.70 8.8 $\pm$ 0.3
7135.78 [Ar III] -0.41 7133.23 17.4 $\pm$ 0.5 7133.11 17.4 $\pm$ 0.5
7155.14 [Fe II] -0.41 ... ... 7152.25 0.1:
7254.35a O I -0.42 ... ... 7251.66 2.3 $\pm$ 0.8
7281.35 He I -0.43 7279.25 1.0 $\pm$ 0.2 7278.96 0.43 $\pm$ 0.04
7318.39 [O II] -0.43 7317.43 9.8 $\pm$ 0.4 7317.18 8.7 $\pm$ 0.3
7329.66 [O II] -0.43 7327.83 9.1 $\pm$ 0.3 7327.59 7.5 $\pm$ 0.2
7377.83 [Ni II] -0.44 7375.68 0.2: 7374.98 0.20 $\pm$ 0.02
7442.30 N I -0.44 ... ... 7438.75 0.09 $\pm$ 0.02
7468.31 N I -0.45 ... ... 7465.74 0.15 $\pm$ 0.03
7751.10 [Ar III] -0.48 7748.92 4.5 $\pm$ 0.1 7748.79 1.56 $\pm$ 0.06
c(H$\beta $)     3.09 $\pm$ 0.02 4.10 $\pm$ 0.04
F(H$\beta $)b     160 $\pm$ 3 73 $\pm$ 2
$n_{\rm e}$([S II])c     6700 $\pm$ 1000 6400 $\pm$ 1200
$n_{\rm e}$([Cl III])c     ... 5400 +8800-900
$T_{\rm e}$([N II])d     10 900 $\pm$ 600 13 400 $\pm$ 400
a Blend of O I lines at 7254.14, 7254.45 and 7254.53 Å. b Observed (uncorrected)
flux in units of 10-16 erg cm-2 s-1. c In cm-3. d In K.

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