\begin{table}%t4
\caption{\label{completeness_mag}Completeness limits of the photometry at different annuli of the Arches cluster.}
%\centering
\small                  
\begin{tabular}{c c c c c}   
\hline\hline                 
50\% completeness limit & $r \leq 0.2~{\rm pc}$ & $0.2 < r \leq 0.4$~pc & $r > 0.4$~pc & NACO field \\ 
\hline                         
   $H$       &  18.2   & 18.7   & 18.9   & 18.7   \\       
   $K_{\rm S}$ &  16.0   & 16.7   & 16.8   & 16.7   \\ 
\hline                                    
\end{tabular}
\end{table}