\begin{table}%T2
\caption{ROSAT observations of \vinef.}
\label{tabobs}
%\centerline
 {
\begin{tabular}{lllllllll}
\hline\hline
 & \multicolumn{2}{c}{Central coordinates} & Date & ROR no. & Exposure  & Count rate$^a$ & 
Background & PI\\
 & RA(2000) & Dec(2000)& & & time [s] & [cts s$^{-1}$] & [cts s$^{-1}$ arcsec$^{-2}$] &\\ \hline
HRI & 9$^{\rm h}$ 32$^{\rm m}$ 9\fs6 & +21\degr 30\arcmin 00\arcsec & April 27--29, 1994 & 
600602h & 13619 & 0.020\ $^b$ & 3.6~\tento{-7}\ $^b$ & N.~Junkes\\
 & 9$^{\rm h}$ 32$^{\rm m}$ 9\fs6 & +21\degr 30\arcmin 00\arcsec & Nov.\ 7, 1994 & dto. &
8284 & & & N.~Junkes\\
PSPC & 9$^{\rm h}$ 32$^{\rm m}$ 9\fs6 & +21\degr 30\arcmin 00\arcsec & May 6--7, 1991 & 
600093p & 9184 & 0.091 & 3.2~\tento{-7} & H.~Zinnecker\\ 
\hline
\end{tabular}}
\smallskip
$^a$ Background subtracted.\\
$^b$ Combined HRI observations.
\end{table}