\begin{table}%t6                                                       
      \caption{\label{sizecoefffit}Size coefficients.}
         \begin{tabular}{p{0.2\linewidth}ccc}                           
          \hline                                                      
            \hline     
           Galaxy &  a  &  b  &  Z  \\                                
            \hline                                                    
           NGC~45   & $0.17 \pm 0.13$ & $0.34 \pm 0.09$  & 0.004 \\                 
           NGC~1313 & $0.4  \pm 0.1$  & $0.25 \pm 0.03$  & 0.008 \\                 
           NGC~4395 & $0.23 \pm 0.16$ & $0.29 \pm 0.07$  & 0.02  \\                  
           NGC~5236 & $0.33 \pm 0.05$ & $0.21 \pm 0.01$  & 0.02  \\                  
           NGC~7793 & $0.54 \pm 0.07$ & $0.16 \pm 0.01$  & 0.004 \\  
            \hline                                                    
         \end{tabular}                                                  
     \smallskip
           Note: ``$a$'' and ``$b$'' are the derived values from Eq.~(\ref{reff}) and 
	 \textit{Z} is the metallicity used for the derived mass in the 
	 Eq.~(\ref{reff}). 
   \end{table}