\begin{table}%t2
\caption{Correlation coefficients of the CCD contamination rates as defined
  in Sect. \ref{badc} vs. the observation parameters listed in the left column of the
  table. The last row shows the critical value of a the statistical test for the significance of the correlation coefficient of the sample at a~95\% confidence
  level adopted from \citet[][]{crow60}. We shown the~99\% confidence level value in parenthesis. Note that the zero correlation is only rejected with the values of the CCD2 column.
\label{tabcorre}}
$$    
         \begin{array}{p{0.3\linewidth}cc}
            \hline \hline
            \noalign{\smallskip}
  &  C_{2} & C_{5}  \\
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
Count rate & 0.806 & -0.127 \\
Effective time & -0.297 & -0.338 \\
Total counts & 0.541 & -0.246 \\
            \noalign{\smallskip}
$ {|r|_{\rm crit}}$ & 0.235~~(0.305) & 0.413~~(0.526) \\
            \noalign{\smallskip}
            \hline
        \end{array}
$$   
\end{table}