\begin{table}%t1
\caption{\label{obssum}Observations of the circumstellar environment of U~Ant.}
%%\centering

\par
\begin{tabular}{l l l  c c c c c}
\hline\hline\noalign{\smallskip}
Instrument & Date 		& Filter & $\lambda_{{\rm cen}}$ 	& $\Delta \lambda_{{\rm FWHM}}$ &pixel 	& $\Delta v$ & $t$\\
		&			& 	&[nm] & [nm]		& [$\arcsec$]	& [km s$^{-1}$] & [s]\\
\hline
EFOSC2	& Apr. 2002	& Str-y		& 548.2 & 18.2 & 0.32 		& $-$ &  \phantom{1}5000\\
		&			& F59		& 589.4 & 5 	& 0.32		& $-$ &  \phantom{1}4600\\
		&			& H$\alpha$	& 657.7 & 6.2 	& 0.32		& $-$ &  \phantom{1}3900\\
		& 			& F77		& 769.9 & 5 	& 0.32		& $-$ &  \phantom{1}\phantom{1}\phantom{1}90\\
EMMI	& Mar. 2004	& F59		& 589.4 & 5	& 0.33		& 4.7 &  \phantom{1}9000\\
		&			& F77		& 769.9 & 5 	& 0.33		& 4.7 &  \phantom{1}9000\\
APEX-2a	& Dec. 2006 & $-$ &  345 GHz & $-$	&18\tablefootmark{a}			& 0.5 & 15~500\\
\hline
\end{tabular}
\tablefoot {The total integration time for each polarisation angle is given for the EFOSC2~observations. For the APEX~observations the total integration time for the map is~given.\\
\tablefoottext{a}{For APEX, ``pixel'' is the beam FWHM.}}
\end{table}