\begin{table}%t8
    \caption{\label{Densityundefolder}Derived values from Eq.~(\ref{densidad}).}
%(1) Galaxy names. (2), (3) ``a'' and ``b''  are the derived constant  values, (4) e-folding distance in arcsecond% from Eq. \ref{densidad}.   
  \begin{tabular}{p{0.2\linewidth}cccc}
    \hline
    \hline
    \noalign{\smallskip}
        & (1) & (2) &(3)\\
    Galaxy &  a  &  b  & {\rm e\mbox{-}folding}\\
    \noalign{\smallskip}
    \hline
    \noalign{\smallskip}
NGC~1313 &  $-0.0082   \pm 0.0007$   & $-1.0    \pm 0.1$  &  $53 \pm 5$  \\
NGC~4395 &  $-0.0018   \pm 0.0009$   & $-2.7    \pm 0.1$  & $241 \pm 120$\\  
NGC~5236 &  $-0.0029   \pm 0.0006$   & $-1.3    \pm 0.1$  & $150 \pm 31$ \\
NGC~7793 &  $-0.005    \pm 0.001$    & $-1.8    \pm 0.1$  & $87 \pm 17$  \\
      \hline
  \end{tabular}
\par
\smallskip
  Note: (1), (2) ``$a$'' and ``$b$''  are the derived constant  values, (3) e-folding distance in arcsecond.
\end{table}