\begin{table}%t4 \caption{EMMI long-slit spectroscopy.} \label{spec} \small%\centerline { \begin{tabular}{c c} \hline \hline Date & 12 July 2004 \\ Period & ESO-073.A \\ Telescope & NTT(3.6 m) \\ Instrument & EMMI (red arm) \\ Dispersing medium & Grism 5 \\ Spectral range & 3800--7020 \AA \\ Dispersion & 1.66 \AA/pixel \\ Resolution & 5 \AA \ {\it FWHM} \\ Detector & $2\times 2048 \times 4096$ MIT/LL CCD \\\ Binning & 2 $\times$ $2$ \\ Gain & 1.32 e$^-$/ADU \\ Read-out-noise & 3.825 e$^-$\\ Scale & 0.332 arcsec/pixel \\ Slit length & 8 arcmin\\ Slit width & 1 and 5 arcsec \\ \hline \end{tabular}} \medskip Dispersion, scale, gain and $RON$ refer to 2~$\times$ $2$~binning. \end{table}