\begin{table}%T3
     \caption{The significance ($Fisher$ test) of the null
       hypothesis that the~${\theta}_{\rm cs}$ are equal in two equal
       subsamples divided by $L_{[\rm {O~III}]}$, $L_{\rm {151}}$ and
       redshift $z$, respectively. Probabilities are calculated for:
       (1) the sample which includes 20 WQs grouped with HEGs rather
       than quasars; (2)~the sample consisting only of HEGs and
       quasars; and (3) the sample which excludes 12 transitional
       sources with $\log~(L_{151}$~/ W~Hz$^{-1}$~sr$^{-1}) < 25.3$.}
     \label{F-test1}
     %\centering
\par
          \begin{tabular}{lccc}
       \hline\hline
       \noalign{\smallskip}
       Relation & {$Fisher$~test} (\%) & {$Fisher$~test} (\%) & $Fisher$~test (\%) \\
       plane    &   (1)           &    (2)          &   (3)  \\
       \noalign{\smallskip}
       \hline
       \noalign{\smallskip}
       $\overline{\theta}_{\rm cs}-L_{[\rm {O III}]}$ & 99.4 & 99.3 & 98.6 \\
       $\overline{\theta}_{\rm cs}-L_{\rm {151}}$     & 63.6 & 71.7 & 60.2 \\
       $\overline{\theta}_{\rm cs}-z$                 & 4.8  & 32.5 & 38.7 \\
       \hline
     \end{tabular}
 \end{table}