Table 14: Observed and model line ratios; .

Parameter	Obs.	Err.a	Modelsb
			5.0	2.0
			-1.00	-1.17
			-1.00	-1.68
N V/C IV	0.635	0.032	0.499	0.433
(O I+Si II)/C IV	0.090	0.010	0.163	0.040
C II/C IV	0.050	0.010	0.199	0.089
(Si IV+O IV])/C IV	0.279	0.014	0.322	0.257
N IV]/C IV	0.030	0.010	0.152	0.066
He II/C IV	0.148	0.010	0.186	0.206
(O III]+Al II)/C IV	0.111	0.010	0.289	0.174
Al III/C IV	0.072	0.010	0.101	0.047
Si III]/C IV	0.068	0.010	0.266	0.083
C III]/C IV	0.336	0.017	0.474	0.240
			5.0	5.0
			-1.00	-1.07
			-1.00	-1.54
N V/C IV	0.819	0.041	0.499	0.795
(O I+Si II)/C IV	0.095	0.010	0.163	0.086
C II/C IV	0.049	0.010	0.199	0.188
(Si IV+O IV])/C IV	0.329	0.016	0.322	0.418
N IV]/C IV	0.023	0.010	0.152	0.145
He II/C IV	0.148	0.010	0.186	0.199
(O III]+Al II)/C IV	0.111	0.010	0.289	0.272
Al III/C IV	0.108	0.010	0.101	0.103
Si III]/C IV	0.112	0.010	0.266	0.157
C III]/C IV	0.321	0.016	0.474	0.314
			5.0	5.0
			-1.00	-1.11
			-1.00	-1.61
N V/C IV	1.034	0.052	0.499	0.840
(O I+Si II)/C IV	0.109	0.010	0.163	0.078
C II/C IV	0.055	0.010	0.199	0.183
(Si IV+O IV])/C IV	0.402	0.020	0.322	0.420
N IV]/C IV	0.019	0.010	0.152	0.152
He II/C IV	0.148	0.010	0.186	0.200
(O III]+Al II)/C IV	0.108	0.010	0.289	0.277
Al III/C IV	0.126	0.010	0.101	0.097
Si III]/C IV	0.105	0.010	0.266	0.149
C III]/C IV	0.379	0.019	0.474	0.323
			5.0	5.0
			-1.00	-1.06
			-1.00	-1.61
N V/C IV	0.979	0.049	0.499	0.846
(O I+Si II)/C IV	0.094	0.010	0.163	0.080
C II/C IV	0.039	0.010	0.199	0.191
(Si IV+O IV])/C IV	0.370	0.018	0.322	0.443
N IV]/C IV	0.045	0.010	0.152	0.138
He II/C IV	0.102	0.010	0.186	0.203
(O III]+Al II)/C IV	0.100	0.010	0.289	0.263
Al III/C IV	0.117	0.010	0.101	0.109
Si III]/C IV	0.134	0.010	0.266	0.141
C III]/C IV	0.281	0.014	0.474	0.269

a Errors adopted for carrying out model fittings. Values are changed from those presented in Table 5; see text for details. b Model predictions with fixed and and those with varying and are given in the left and right columns, respectively.