\begin{table}%t1
%\centering
\par
\caption{Percentage of area covered by the different magnetic field ranges.\label{tab1}} 
\begin{tabular}{ccccc} 
\hline\hline
%
 & \multicolumn{2}{c}{full disk ($\ast$)} &  \multicolumn{2}{c}{quiet box 
 ($\diamond$)}\\
%\hline
 & near min & near max & near min & near max  \\ 
\hline 
  $B$ $<$ 20 G             & 87      & 75  & 90     & 87 \\
% 10 G $\le$ $B$ $<$ 20 G   & 30      & 29  & 30     & 30  \\
 20 G $\le$ $B$ $<$ 40 G   & 12     & 15   & 9.25   & 10.5  \\
 40 G $\le$ $B$ $<$ 60 G   & 0.5    &  3  & 0.5   & 1.25  \\
 60 G $\le$ $B$            & 0.5    &  7  & 0.25   & 1.25  \\
 20 G $\le$ $B$            &  13     & 25  & 10     & 13  \\
\hline
\end{tabular}
%
\end{table}