\begin{table}%t3  non: t4!!!!!
\caption{\label{table:observed_widths}Published UIR band widths ($FWHM$, in \um) in the diffuse interstellar 
              medium.}
 $$
\begin{tabular}{l l l l l l l l}
   \hline
   \hline
   Source & 6.2 (\um ) & 7.7 (\um) & 8.6 (\um) & 11.3 (\um) &
   Resolution (\um)& Instrument & Notes\\
   \hline
    Mattila et~al. (\cite{Mattila96}) & 0.20  & 0.71 & 0.42 & 0.27 & 0.1 & ISO/PHT-S & emission\\
    Onaka et~al. (\cite{Onaka96}) & 0.67  & 0.91 & 0.55 & 0.63 & 0.3 & IRTS/MIRS & emission\\
    Schutte et~al. (\cite{Schutte98}) & 0.15 & -- & -- & -- & 0.004 & ISO/SWS & absorption\\
    This study & 0.24  & 0.76 & 0.33 & 0.27 & 0.1 & ISO/PHT-S & emission\\
   \hline
   \end{tabular}
   $$
\par
   \end{table}