\begin{table}%t1
\caption{Photometric and spectroscopic observations.}
\label{Tlog}
%\centering
\par
\begin{tabular}{ccccccc}
\hline\hline
\noalign{\smallskip}
\multicolumn{3}{c}{Images} & & \multicolumn{3}{c}{Spectra}\\
\cline{1-3} \cline{5-7}
\noalign{\smallskip}
Filter & Exp. (s) & Date & & Range~(\rm{\AA}) & Exp.~(s) & Date \\
\hline
\noalign{\smallskip}
$B$ & 1200 & 31.07.92 & & 3600--7000 & $3\times 900$ & 2.04.02 \\
$R$ & 600  & 31.07.92 & & 5700--9000 & $3\times 900$ & 4.04.02 \\
\noalign{\smallskip}
\hline
\end{tabular}
\end{table}