\begin{table}%t2
\caption{Instrumental details of the observing runs.}
\label{truns}
%\centerline
{\begin{tabular}{cccccccc} \hline \hline
 Run  &  Dates & Telescope & Instrument &  Dispersion & Spectral range &
Slit width & {\it FWHM}$^{a}$ \\
  & & & &  \AA/pixel &  \AA &  arcsec &  \AA \\ \hline
1 & 13/08/96--16/08/96 & INT 2.5~m & IDS   & 1.6 & 3908--5535 & 2.0 & 3.9 \\
2 & 31/08/97--03/09/97 & INT 2.5~m & IDS   & 1.6 & 3908--5535 & 2.0 & 4.3 \\
3 & 08/03/97--11/03/97 & ESO 3.6~m & EFOSC & 3.4 & 3776--5504 & 1.5 & 8.3 \\
4 & 23/09/97--25/09/97 & NTT 3.6~m & EMMI  & 1.3 & 3971--6649 & 1.0 & 3.7 \\
5 & 23/08/98--26/08/98 & NTT 3.6~m & EMMI  & 1.3 & 3985--6649 & 1.5 & 4.9 \\
\hline
\end{tabular}}
\medskip
\par
$^{a}$ Spectral resolution as measured from arc lines.
\end{table}