\begin{table}%t2
\caption{\label{tab2}Instrument and spectra general characteristics.} 
%\centering
\par
\begin{tabular}{lccccccccc} 
\hline\hline 
Observatory/tel&spectrograph&size CCD&pixel size&grating&dispersion&spectral coverage&width 
slit&resolution&lenght slit\\
&&(pixels)&($\mu$m$^2$)&(grooves mm$^{-1}$)&(\AA/pixel)&(\AA)&($^{\prime\prime})$&(\AA)&($^{\prime}$)\\
\hline
ESO 1.52~m&B\&C&2688~$\times$~512&15~$\times$~15&300&3.72&3600--10~100&3.5&18&4.1\\
CASLEO 2.15~m&B\&C&1024~$\times$~1024&24~$\times$~24&300&3.43&3600--6800&4.0&14&4.7\\
\hline
\end{tabular} 
\end{table}