\begin{table}%t2
\caption{\label{T:phot}Photometric-quality requirements for stars
to enter the algorithm.}     
%\centering
                          % used for centering table
\begin{tabular}{c  c  c  c  r  c }        % centered columns (4 columns)
\hline\hline                 % inserts double horizontal lines
$V$-mag & \multicolumn{2}{c}{$\rm \#$-parm.} & \multicolumn{2}{c}{$\rm \chi$-parm.} & 
error($U$, $B$, $V$) \\    % table heading 
      & MIN         &      MAX             & MIN         &      MAX              &    MAX     \\  
\hline                        
   $\le$19.0 &--2 & 2 & 0.5 & 30 & 0.05 \\   
   $ > $19.0 & --2 & 2 & 0.5 &  4 & 0.05 \\   
\hline                        
\end{tabular}
\end{table}