\begin{table}%t1
\caption{Full width 70$\%$ enclosed flux$/(\lambda/D)$.}
\label{table:1}       
\small%\centering
\par
\begin{tabular}{c c c }  
\hline\hline             
$D/r_0$ & Mean & rms \\  
\hline                   
    5.0    &  6.48  &  0.68  \\
    6.5    &  8.26  &  0.87  \\
    8.3    & 10.84  &  1.04  \\
   12.5    & 16.00  &  1.25  \\
   16.7    & 20.74  &  1.52  \\
\hline                                    
\end{tabular}
\end{table}