\begin{table}%t1 
%\centering
\par
\caption{Observing runs. The first column gives the month and year of the observations, the second column lists the instrumental combination utilized. The third column gives the number of spectra.}  
\begin{tabular}{c c c }  
\hline\hline\noalign{\smallskip}  
Date  & Instr. configuration  & $n$ \\  
\noalign{\smallskip}\hline\noalign{\smallskip}  
\multicolumn{3}{c}{High-resolution spectra}\\  
\noalign{\smallskip} \noalign{\smallskip}  
Feb.-97& Echelle-REOSC, 2.15-m, CASLEO& 2 \\ 
Mar.-97& CES+LC, CAT 1.4-m, ESO       & 4 \\ 
Feb.-98& Echelle-REOSC, 2.15-m, CASLEO& 5 \\ 
Feb.-99& Echelle-REOSC, 2.15-m, CASLEO& 3 \\ 
May-01& FEROS, 1.5-m, ESO            & 4 \\ 
Mar.-02& FEROS, 1.5-m, ESO            & 4 \\ 
Mar.-02& EMMI-REMD/Ech, NTT, ESO      & 2 \\ 
Apr.-02& FEROS, 1.5-m, ESO            & 1 \\ 
Jan.-03& Echelle-REOSC, 2.15-m, CASLEO& 4 \\ 
Mar.-03& Echelle-REOSC, 2.15-m, CASLEO& 3 \\  
Apr.-03& Echelle-REOSC, 2.15-m, CASLEO& 5 \\ 
May-03& FEROS, 2.2-m, ESO            & 3 \\ 
Dec.-03& Echelle-REOSC, 2.15-m, CASLEO& 2 \\ 
May-04& FEROS, 2.2-m, ESO            & 3 \\ 
Apr.-05& Echelle, 2.5-m, LCO   & 4 \\ 
Feb.-06& Echelle, 2.5-m, LCO   & 1 \\      
\noalign{\smallskip}\hline\noalign{\smallskip}  
\multicolumn{3}{c}{Medium-resolution spectra}\\  
\noalign{\smallskip} \noalign{\smallskip}  
Feb.-94& 2D-Frutti, 1-m, CTIO         & 2 \\ 
Apr.-96& B\&C, 1.5-m, ESO             & 2 \\ 
Feb.-02& CSpec, 1.5-m, CTIO           & 4 \\  
\noalign{\smallskip}\hline \noalign{\smallskip}  
\multicolumn{3}{c}{Low-resolution spectra}\\  
\noalign{\smallskip} \noalign{\smallskip}  
May-73& Cass, 0.9-m, CTIO            & 2 \\ 
Dec.-97& B\&C, 2.15-m, CASLEO         & 4 \\ 
Apr.-01& REOSC-DS, 2.15-m, CASLEO     & 6 \\ 
\noalign{\smallskip}\hline  
\end{tabular}  
\label{runs}
\end{table}