\begin{table} %t1
\caption{\label{tab_instr}Grism properties.}
\small%\centering
\par
\begin{tabular}{llll} 
\hline \hline 
\multicolumn{1}{c}{Telescope} & Grism & Dispersion & Range \\
& & (\AA~/pix) & (\AA~) \\
\hline
TNG~3.6 m & LR-B Grism 1& 2.8 & 3800$-$8000 \\ 
ESO~3.6 m & Grism 1 & 6.66 & 3185$-$10940 \\
& Grism 6 & 2.06 & 3860$-$8070 \\
& Grism 13 & 2.77 & 3685$-$9315 \\
KPNO 4 m & Grism 810 & 9.1 & 4300$-$10~000 \\
\hline
\end{tabular}
\end{table}