\begin{table}%T3
%\centering
\par
\caption{SiO emission in external galaxies. {Column~2}: SiO abundance averaged within $28\arcsec$ (from observations
with the IRAM 30~m telescope); the averaging scale is ${\sim}0.5$~kpc, for  \object{NGC~253},  \object{IC~342}
and \object{M~82}, and ${\sim}2$~kpc for \object{NGC~1068}; {Col.~3:} components resolved with the PdBI
contributing to the global SiO emission; {Col.~4}: SiO abundance in the resolved components; {Col.~5}:
mechanism proposed to be  enhancing the SiO abundance; underlying physical process, in brackets (DW stands for
"density waves'');  {Col.~6}:  references: \emph{a}: Garc\'{\i}a-Burillo et~al. (\cite{buri00}); \emph{b}: this
work;   \emph{c}: Garc\'{\i}a-Burillo et~al. (\cite{buri01b});  \emph{d}: Usero et~al. (\cite{user04});
\emph{e}: \mbox{Mart\'{\i}n-Pintado} et~al. (2005, in prep.).    
}
\label{tabgal}
\input{4033tab3}
\end{table}