\begin{table}%t1
\caption{\label{tab1}Sources of spectroscopic observations:  1 -- 
Observatory; 2 --  code assigned to each combination of telescope + equipment 
used throughout this paper;  3 --  telescope aperture  and spectrograph;
4 --  projected spectrograph entrance apertures (the first number is the
slit width, and the second is the slit length); 5 --  focus of the
telescope. } 
\small%\centering
\par
\begin{tabular}{lllll}
\hline\hline
Observatory                 &Code  &Tel. and equip. & Aperture        &Focus\\
\hline
 SAO(Russia)           & L(N) &  6 m+Long slit &  2.0 $\times$ 6.0        &  Nasmith\\
 SAO(Russia)           & L(U) &  6 m+UAGS      &  2.0 $\times$ 6.0        &  Prime  \\
 SAO(Russia)           & L(S) &  6 m+Scorpio   &  1.0 $\times$ 6.0        &  Prime    \\
 Gullermo Haro(M\'exico) & GH   &  2.1 m+B$\&$C     &  2.5 $\times$ 6.0        &  Cassegrain\\
 San--Pedro(M\'exico)     & S-P  &  2.1 m+B$\&$C     &  2.5 $\times$ 6.0        &  Cassegrain\\
 SAO(Russia)           & L1(G)&  1 m+GAD       &  4.2(8.0) $\times$ 19.8  &  Cassegrain\\
  SAO(Russia)           & L1(U)&  1 m+UAGS+CCD2K&  4.0 $\times$ 9.45&  Cassegrain\\
\hline
\end{tabular} 
\end{table}