**Table 1:** The average continuum flux and slope of the Baldwin effect in four different observation epochs. The standard deviations of these two values are also given. The flux is in units of $\rm 10^{-13}~erg~s^{-1}~cm^{-2}~\AA^{-1}$ .
$\begin{table} \begin{displaymath} \begin{array}{cccccccc} \hline \hline\noalig... ...0.754 & 0.777 & -0.223 & 0.056\\ \hline \end{array}\end{displaymath}\end{table}$

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