Table 4: Model "predictions'' for I Zw 18 NW: model intensities divided by observed intensities.
Line ident. Obs. N0-N1 M1 M2 M3 M4
  2 3 - 4 5 6 7 8
$Q_{\rm abs}$/Qa 0.37 .20-.43 0.20 0.34 0.38 0.43
C IV 1549 500: .14-.41 1.12 0.65 0.64 1.08
[O I]$\:$6300+ 8.5 .01-.59 1.19 1.01 0.95 1.38
[O II]$\:$7320+ 6.3: 1.5-1.24 1.19 1.18 1.19 1.15
[O III]$\:$4363 65.9 .73-.82 0.96 0.96 1.00 0.94
[O IV]$\:$25.9$\mu$ 49.1 .37-.84 1.08 0.97 0.94 0.98
[Ne II]$\:$12.8$\mu$ 9.0: .14-.10 0.14 0.21 0.22 0.23
[Ne III]15.5$\mu$ 45.7 1.31-1.22 1.09 1.07 1.02 1.11
[Si II]$\:$34.8$\mu$ 157. .03-.10 0.17 0.14 0.14 0.18
Si III]$\:$1882+ 270: .85-.99 1.12 1.26 1.34 1.16
[S II]$\:$6716 22.5 .30-.54 0.96 0.78 0.77 1.10
[S II]$\:$6731 16.9 .30-.51 0.96 0.78 0.77 1.10
[S II]$\:$4068b 3.7b .30-.43 0.73 0.58 0.58 0.80
[S III]$\:$9531+ 114. 1.15-1.05 0.95 0.99 1.00 0.92
[S III]$\:$6312 6.7 .89-.84 0.77 0.85 0.87 0.75
[S III]$\:$18.7$\mu$ 28. 1.15-1.01 0.94 0.95 0.94 0.91
[S III]$\:$33.5$\mu$ 120. .45-.44 0.39 0.40 0.40 0.39
[S IV]$\:$10.5$\mu$ 48. .87-1.50 2.15 1.93 1.97 2.15
[Ar IV]$\:$4740 4.5 .26-.73 1.87 1.39 1.47 1.76
[Fe II]$\:$26.0$\mu$ 34. .00-.05 0.10 0.10 0.10 0.14
[Fe III]$\:$4986 7.4 .78-1.15 0.90 0.94 0.89 0.89
[Fe IV]$\:$4906 3.0: .54-.70 0.96 1.02 1.09 1.02
[Fe V]$\:$4227 1.8: .84-2.3 2.1 3.1 3.2 3.1
a $Q_{\rm abs}$/Q: absolute values.
b ${\lambda }$ 4068 intensity not corrected for [Fe V]${\lambda }$ 4071 (Table 3).


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