\begin{table}%t1
   %\centering
\par
   \caption{Transformation between $g'-r'$ and $V-R _{\rm C}$.}\label{tab1}
 $$ \begin{tabular}{rcl}
  \hline\hline
$V$& =& $g' - 0.55(g'-r') - 0.03$\\
$V-R _{\rm C}$ & =& $0.59(g'-r') + 0.11$\\
$R _{\rm C} $ & =&$ -0.14g' + 1.14r' +0.14$\\
\hline
\end{tabular}$$
\end{table}