\begin{table}%t4
\caption{\label{tab:param}The values are those for the best fit.
           For comparison, we give the corresponding values for the Galaxy 
           from D\'esert et~al. (\cite{esert1990}).}
%\centering
\par
  \begin{tabular}{l|*{3}{ll|}ll}
    \hline
    \hline
      \multicolumn{1}{c|}{}              &
      \multicolumn{2}{c|}{PAH} &
      \multicolumn{2}{c|}{VSG} &
      \multicolumn{2}{c|}{BG}  &
      \multicolumn{1}{c}{} & \multicolumn{1}{l}{ VCG} \\
    \hline
      \multicolumn{1}{c|}{}             &
      Milky       &  NGC         &
      Milky       &  NGC         &
      Milky       &  NGC         &
                      &  NGC         \\
      \multicolumn{1}{c|}{}             &
        Way	&   1569        &
        Way	&   1569        &
        Way	&   1569        &
                      &  1569        \\
    \hline
      $ Y$        &
      $4.3\times 10^{-4}$ & $\la$$1.0\times 10^{-6}$ &
      $4.7\times 10^{-4}$ & $1.8\times 10^{-5}$ &
      $6.4\times 10^{-3}$ & $4.4\times 10^{-4}$ &
      $ Y$            & $(1.3{-}0.4)\times 10^{-3}$ \\
    \hline
      $ a_-$      &
      4 \AA           & 4 \AA     &
      12 \AA          & 12 \AA    &
      150 \AA         & 22 \AA    &
      $T$           & $5{-}7\;$ K       \\
    \hline
      $ a_+$      &
      12 \AA          & 12 \AA    &
      150 \AA         & 78 \AA    &
      1100 \AA        & 1100 \AA  &
      $ \beta$    & 1.0             \\
    \hline
      $ \alpha$   &
      3               & 3               &
      2.6             & 4.0             &
      2.9             & 6.3             &
      \multicolumn{2}{c}{} \\
    \cline{1-9}
  \end{tabular}
    \end{table}