\begin{table}%t6
%\centering
\par
\caption{\label{rejthreshtab}Rejection thresholds.}
\begin{tabular}{cccccc}
\hline \hline
Code  & Low-$z$ & & & High-$z$ & \\
      & $BVI$ & $BVIK$ & $BVIJK$ & $VRI$ & $VRIJK$ \\
\hline
GR code & 0.350 & 0.475 & 0.300 & 0.200  & 0.050 \\
{\it Hyperz} & 0.150 & 0.425 & 0.425 & 0.050  & 0.400 \\
\hline
\end{tabular}
\end{table}