\begin{table}%t2
\caption{\label{table2}Observing parameters.}
%\centering
\par
\begin{tabular}{ll}
\hline\hline
Date of Observations & 10--13 May 99 \\
Observer  & Zeilinger W.\\
Spectrograph & B \& C grating \#25\\
Detector & ESO CCD \#39, Loral 2K UV flooded\\
Pixel size ($\mu$m) & 15  \\
Scale along the slit (\arcsec/px$^{-1}$) & 0.82 \\
Slit length (\arcmin) & 4.5 \\
Slit width (\arcsec) & 2  \\
Dispersion (\AA\ mm$^{-1}$) & 187 \\
Spectral resolution ({\it FWHM} at~5200~\AA\ ) (\AA ) & 7.6  \\
Spectral range (\AA ) & 3622$-$9325 \\
Seeing range ({\it FWHM}) (\arcsec) & 1.2$-$2  \\
Standard stars & Feige 56, ltt 1788, ltt 377 \\
\hline
\end{tabular}
%\vspace*{4mm}
\end{table}