\begin{table}%t2
  \caption{Statistical moments of the dimensionless rate of
    energy transfer for the probability density functions
    plotted in Fig.~\ref{fg:transf_pdf}b.}
  \label{tb:closr_stat_momt}
%\centering
\par
    \begin{tabular}{l c c c}
      \hline\hline
\noalign{\smallskip}
      Computation & $\langle\tilde{\Sigma}_{<}\rangle$ & 
      $\sigma(\tilde{\Sigma}_{<})$ & ${\rm skew}(\Sigma_{<})$ \\
\noalign{\smallskip}
      \hline
      explicit                                  & 0.330 & 0.526 & 3.70 \\
      stat.~closure                             & 0.293 & 0.327 & 3.53 \\
      locl.~closure ($\gamma_{{\rm T}}=1.5$) & 0.313 & 0.552 & 3.71 \\
      locl.~closure ($\gamma_{{\rm T}}=2.0$) & 0.273 & 0.540 & 3.88 \\
      locl.~closure ($\gamma_{{\rm T}}=3.0$) & 0.234 & 0.525 & 3.73 \\
      locl.~closure ($\gamma_{{\rm T}}=4.0$) & 0.183 & 0.504 & 3.51 \\
      \hline
    \end{tabular}
\end{table}