Table 3: Model outputs for I Zw 18 NW: N0 and M2.
Line id./Models Obs. N0 N0/O M2 M2/O

Absolute fluxes (I(H $\beta$ ) in 10^-14 erg cm^-2 s^-1)

I(H $\beta$ ) 5.6 5.6 1.00 5.6 1.00

1.43 $\:$ GHz $\:$ /mJy 0.433 0.240 0.55 0.256 0.59

8.45 $\:$ GHz $\:$ /mJy 0.286 0.202 0.71 0.216 0.76

Relative line fluxes (wavelengths in Å or $\mu$ m)

H I 4861 1000. 1000. 1.00 1000. 1.00

H I 6563 2860. 2840. 0.99 2830. 0.99

H I 4340 461. 473. 1.03 473. 1.03

H I 4102 266. 267. 1.00 267. 1.00

H I 1215 (/10) - 2950. - 3010. -

H I 2 $h\nu$ (/10) - 1550. - 1620. -

He I 3888 90.4 89.6 0.99 90.5 1.00

He I 4471 21.4 34.9 1.63 35.2 1.64

He I 5876 67.7 92.0 1.36 91.3 1.35

He I 6678 25.3 25.3 1.00 25.6 1.01

He I 7065 24.4 23.4 0.96 22.9 0.94

He I 10830 - 251. - 190. -

He II 4686 36.8 36.8 1.00 36.8 1.00

C III] 1909+07 467. 467. 1.00 467. 1.00

Si III] 1882+92 270.: 229. 0.85 340. 1.26

Al III 1855+63 111.: 42.9 0.39 82.9 0.75

O III] 1664 <230 127. >.5 208. >.9

C IV 1549 510.: 74.2 0.14 334. 0.65

Si IV 1397 $\rbrace$ ^a <300 22.7 >.1 127. >.5

O IV] 1398 $\rbrace$ * 2.0 * 24.9 *

[N II] 6584+48 9.2 9.2 1.00 9.2 1.00

[O I] 6300+63 8.5 0.12 0.01 8.6 1.01

[O II] 3726+29 238. 238. 1.00 238. 1.00

[O II] 7320+30 6.3: 9.5 1.50 7.5 1.18

[O III] 5007+.. 2683. 2680. 1.00 2680. 1.00

[O III] 4363 65.9 47.8 0.73 63.2 0.96

[O III] 51.8 $\:\mu$ m - 174. - 137. -

[O III] 88.3 $\:\mu$ m - 216. - 213. -

[O IV] 25.9 $\:\mu$ m 49.1 18.2 0.37 47.8 0.97

[Ne II] 12.8 $\:\mu$ m 9.0: 1.3 0.14 1.9 0.21

[Ne III] 3868+.. 191. 191. 1.00 191. 1.00

[Ne III] 15.5 $\:\mu$ m 45.7 60.0 1.31 48.9 1.07

Mg I] 4571+62 <3.0 1.5 >.5 1.2 >.4

[Si II] 34.8 $\:\mu$ m 157. 4.7 0.03 22.0 0.14

[S II] 6716 22.5 6.7 0.30 17.6 0.78

[S II] 6731 16.9 5.1 0.30 13.1 0.78

[S II] 4068 $\:\rbrace$ 3.7 1.1 0.41 2.2 0.99

[Fe V] 4071 $\rbrace$ * 0.4 * 1.5 *

[S III] 9531+.. 114. 130. 1.15 113. 0.99

[S III] 6312 6.7 6.0 0.89 5.7 0.85

[S III] 18.7 $\:\mu$ m 28.0 32.2 1.15 26.2 0.95

[S III] 33.5 $\:\mu$ m 120. 54.5 0.45 48.0 0.40

[S IV] 10.5 $\:\mu$ m 48.0 41.7 0.87 92.6 1.93

[Ar III] 7136+.. 23.5 23.5 1.00 23.5 1.00

[Ar III] 8.99 $\:\mu$ m - 8.6 - 8.1 -

[Ar IV] 4711 $\rbrace$ 8.6 1.5 0.76 8.2 1.53

He I 4713 $\:\:\rbrace$ * 5.0 * 5.0 *

[Ar IV] 4740 4.5 1.2 0.26 6.2 1.39

[Fe II] 5.34 $\:\mu$ m - 0.1 - 10.8 -

[Fe II] 26.0 $\:\mu$ m 34. 0.0 0.00 3.4 0.10

[Fe III] 4658 4.5 4.5 1.00 4.5 1.00

[Fe III] 4986 7.4 5.8 0.78 7.0 0.94

[Fe III] 22.9 $\:\mu$ m - 2.2 - 3.2 -

[Fe IV] 4906 3.0: 1.6 0.54 3.1 1.02

[Fe V] 4227 1.8 1.5 0.84 5.5 3.10

^a In Col. 1, blends are indicated by braces. The observed intensity of a blend
is attributed to the first line and an asterisk to the second line.

**Table 3:** Model outputs for I Zw 18 NW: N0 and M2.
Line id./Models	Obs.	N0	N0/O	M2	M2/O
Absolute fluxes (I(H $\beta$ ) in 10^-14 erg cm^-2 s^-1)
I(H $\beta$ )	5.6	5.6	1.00	5.6	1.00
1.43 $\:$ GHz $\:$ /mJy	0.433	0.240	0.55	0.256	0.59
8.45 $\:$ GHz $\:$ /mJy	0.286	0.202	0.71	0.216	0.76
Relative line fluxes (wavelengths in Å or $\mu$ m)
H I 4861	1000.	1000.	1.00	1000.	1.00
H I 6563	2860.	2840.	0.99	2830.	0.99
H I 4340	461.	473.	1.03	473.	1.03
H I 4102	266.	267.	1.00	267.	1.00
H I 1215 (/10)	-	2950.	-	3010.	-
H I 2 $h\nu$ (/10)	-	1550.	-	1620.	-
He I 3888	90.4	89.6	0.99	90.5	1.00
He I 4471	21.4	34.9	1.63	35.2	1.64
He I 5876	67.7	92.0	1.36	91.3	1.35
He I 6678	25.3	25.3	1.00	25.6	1.01
He I 7065	24.4	23.4	0.96	22.9	0.94
He I 10830	-	251.	-	190.	-
He II 4686	36.8	36.8	1.00	36.8	1.00
C III] 1909+07	467.	467.	1.00	467.	1.00
Si III] 1882+92	270.:	229.	0.85	340.	1.26
Al III 1855+63	111.:	42.9	0.39	82.9	0.75
O III] 1664	<230	127.	>.5	208.	>.9
C IV 1549	510.:	74.2	0.14	334.	0.65
Si IV 1397 $\rbrace$ ^a	<300	22.7	>.1	127.	>.5
O IV] 1398 $\rbrace$	*	2.0	*	24.9	*
[N II] 6584+48	9.2	9.2	1.00	9.2	1.00
[O I] 6300+63	8.5	0.12	0.01	8.6	1.01
[O II] 3726+29	238.	238.	1.00	238.	1.00
[O II] 7320+30	6.3:	9.5	1.50	7.5	1.18
[O III] 5007+..	2683.	2680.	1.00	2680.	1.00
[O III] 4363	65.9	47.8	0.73	63.2	0.96
[O III] 51.8 $\:\mu$ m	-	174.	-	137.	-
[O III] 88.3 $\:\mu$ m	-	216.	-	213.	-
[O IV] 25.9 $\:\mu$ m	49.1	18.2	0.37	47.8	0.97
[Ne II] 12.8 $\:\mu$ m	9.0:	1.3	0.14	1.9	0.21
[Ne III] 3868+..	191.	191.	1.00	191.	1.00
[Ne III] 15.5 $\:\mu$ m	45.7	60.0	1.31	48.9	1.07
Mg I] 4571+62	<3.0	1.5	>.5	1.2	>.4
[Si II] 34.8 $\:\mu$ m	157.	4.7	0.03	22.0	0.14
[S II] 6716	22.5	6.7	0.30	17.6	0.78
[S II] 6731	16.9	5.1	0.30	13.1	0.78
[S II] 4068 $\:\rbrace$	3.7	1.1	0.41	2.2	0.99
[Fe V] 4071 $\rbrace$	*	0.4	*	1.5	*
[S III] 9531+..	114.	130.	1.15	113.	0.99
[S III] 6312	6.7	6.0	0.89	5.7	0.85
[S III] 18.7 $\:\mu$ m	28.0	32.2	1.15	26.2	0.95
[S III] 33.5 $\:\mu$ m	120.	54.5	0.45	48.0	0.40
[S IV] 10.5 $\:\mu$ m	48.0	41.7	0.87	92.6	1.93
[Ar III] 7136+..	23.5	23.5	1.00	23.5	1.00
[Ar III] 8.99 $\:\mu$ m	-	8.6	-	8.1	-
[Ar IV] 4711 $\rbrace$	8.6	1.5	0.76	8.2	1.53
He I 4713 $\:\:\rbrace$	*	5.0	*	5.0	*
[Ar IV] 4740	4.5	1.2	0.26	6.2	1.39
[Fe II] 5.34 $\:\mu$ m	-	0.1	-	10.8	-
[Fe II] 26.0 $\:\mu$ m	34.	0.0	0.00	3.4	0.10
[Fe III] 4658	4.5	4.5	1.00	4.5	1.00
[Fe III] 4986	7.4	5.8	0.78	7.0	0.94
[Fe III] 22.9 $\:\mu$ m	-	2.2	-	3.2	-
[Fe IV] 4906	3.0:	1.6	0.54	3.1	1.02
[Fe V] 4227	1.8	1.5	0.84	5.5	3.10

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