\begin{table}%T1
     \caption{The Kolmogorov-Smirnov test is used to estimate the
significance level of the hypothesis that the [O~III] emission-line
luminosity (and radio luminosity) distributions of HEGs and quasars
(QSOs), HEGs and WQs, and, QSOs and WQs are drawn from the same parent
distribution.}
     \label{KS-test}
     $$ 
     \begin{tabular}{cccc}
       \hline \hline
       \noalign{\smallskip}
       $L_{[\rm {O III}]}$ & {K-S~test} & $L_{151}$ & {K-S~test}  \\
       distribution        &   (\%)      & distribution   &   (\%)       \\
       \noalign{\smallskip}
       \hline
       \noalign{\smallskip}
       QSO-HEG & 99.99 & QSO-HEG & 99.66  \\
       QSO-WQ  & 98.77 & QSO-WQ  & 99.81  \\
       HEG-WQ  & 16.60 & HEG-WQ  & 79.47  \\
       \noalign{\smallskip}
       \hline
     \end{tabular}
     $$ 
  \end{table}