**Table 11:** Measured fluxes by adopting local continuum method.
Line Ratio	our composite^a		Vanden Berk et al. (2001)
	local cont.	Eq. (1)^b	local cont.
N V/C IV	0.097 $\pm$ 0.001	0.506 $\pm$ 0.004	0.097 $\pm$ 0.008
Si II/C IV	0.012 $\pm$ 0.001	0.089 $\pm$ 0.001	0.012 $\pm$ 0.000
He II/C IV	0.027 $\pm$ 0.001	0.147 $\pm$ 0.001	0.021 $\pm$ 0.001
Al III/C IV	0.016 $\pm$ 0.001	0.064 $\pm$ 0.001	0.013 $\pm$ 0.001
Si III]/C IV	0.006 $\pm$ 0.001	0.093 $\pm$ 0.001	0.006 $\pm$ 0.001
C III]/C IV	0.424 $\pm$ 0.003	0.285 $\pm$ 0.005	0.630 $\pm$ 0.002

^a The quasar composite spectrum for $2.0 \leq z < 2.5$ and $-24.5 > M_B \geq -25.5$ is used.
^b The given values are the same as those in Table 3.

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