\begin{table}%t3
%\centering
\par
\caption{IRAS flux densities for Mkn~297 (from %Sanders et~al.
 \citealt{san:2003}).  The four columns
list the filter used, the  wavelength range, the  reference wavelength for the filter
and the flux density measured.} \label{t3}
\begin{tabular}{lccc}
\hline\hline\noalign{\smallskip}     
     Filter       &  $\Delta\lambda$ &  $\lambda_{\rm ref}$ &    Total  flux density \\
                  &   ($\mu$m)       &  ($\mu$m)               &        (mJy)           \\
\hline\noalign{\smallskip} 
IRAS  12~$\mu$m  &  8.5--15       &   12                    &   280~$\pm$~22       \\
IRAS  25~$\mu$m  &  19--30        &   25                    &   830~$\pm$~27       \\  
IRAS  60~$\mu$m  &  40--80        &   60                    &  6790~$\pm$~45       \\
IRAS 100~$\mu$m  &  83--120       &  100                    & 10~570~$\pm$~340      \\
\hline
\end{tabular} 
%\label{LWS}
\end{table}