Table 4: Comparison of calculated with observed line ratios (H$\beta $ = 1).
Line D3 MB3 D9 MB9 D18 MB18 D34,35 MB34 D38,40 MB38
region SW - SW - SW - SW - SW -
  Obs.1 Calc. Obs. Calc. Obs. Calc. Obs. Calc. Obs. Calc.
[OIII]4959+5007 2.92 2.91 1.82 1.84 1.186 1.13 - - 2.17 2.15
[NII] 5755 0.22 0.5 0.18 0.5 0.188 0.5 - - 0.148 0.57
HeI 5876 0.19 0.166 0.116 0.15 0.215 0.17 0.15 : 0.196 0.08 0.15
[OI] 6300+6364 0.79 1.13 1.0 1.08 2.58 2.0 1.39 1.16 0.734 0.64
[NII] 6548+6583 5.87 5.9 6.09 6.3 9.2 6.4 5.07 5.2 3.76 6.11
[SII] 6717 0.96 0.83 0.67 0.78 1.28 1.9 0.39 0.47 0.2 0.26
[SII] 6730 1.59 1.1 1.30 1.1 2.55 2.0 0.78 0.85 0.38 0.59
H$\alpha^2$ 69. - 164. - 74.2 - 39.5 - 136.6 -
E(B-V)3 0.8969 - 0.8034 - 0.9648 - 0.90054 - 0.9077 -
w(m1) - 12 - 20 - 10 - 3 - 25
w(m3) - 12 - 12 - 10 - 7 - 5
w(m4) - 0 - 0 - 0 - 0 - 8
w(m5) - 3 - 3 - 0 - 3 - 1
w(m6) - 3 - 3 - 1 - 7 - 2
w(m7) - 1 - 1 - 0 - 1 - 0
w(m8) - 1.8 - 1 - 4 - 0 - 4
w(m9) - 6 - 6 - 15 - 1 - 0
CF (10-10) - 1.5 - 3. - 0.5 - 5.9 - 2.3
1 Observations by Blair et al. (1991, Table 2).
2 In 10-15  $\rm erg~cm^{-2}~s^{-1}$.
3 Reddening correction assumes intrinsic H$\alpha $/H$\beta $ = 3.0.
4 A E(B-V)= 0.9005 means that extinction of bright filaments is assumed.

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