\begin{table}%t1
\caption{Standard stars used in our spectral classification.}
\label{tab_stand}
\small%\centerline
{
\begin{tabular}{llc} 
\hline \hline
Star                & Spectral & Spectral type   \\
&type  &References \\
\hline
HD 78277  &	G2 IV	& (1)\\
HD 237822&	G3 V	&(2)\\
SAO 81292&	M4.5 Ve	&(1)	\\
HD 104979&	G8 IIIa&	(2)\\
HD 101501&	G8 V	&(2)\\
HD 113226&	G8 III	&(2)\\
HD 112872&	G6 III	&(1)\\
HR 6511&	A1 Vn	&(2)\\
HR 6826&	B9 IIIn	&(2)\\
HD 201092&	K7 V	&(2)\\
HD 219134 &	K3 V	&(2)\\
HD 5351&	K4 V	&(1)\\
BD 63 0137&	M1 V	&(1)	\\
HD 196755&	G5 IV	&(2)\\
HD 2506&	G4 III	&(1)\\
SAO 55164&	K0 III	&(1)	\\
HD 4628&	K2 V	&(2)\\
HD 6111&	F8 V	&(1)\\
HD 10032&	F0 V	&(1)\\
HD 10476&	K1 V	&(2)\\
HD 70178&	G5 IV	&(1)\\
HD 66171&	G2 V	&(1)\\
HD 83140&	F3 IV	&(1)\\
HD 110964&	M4 III	&(1)\\
HD 210027&	F5 V	&(2)\\
\hline
\end{tabular}}
\medskip
$(1)$: Jacoby et~al. (\cite{Jaco84}).\\
$(2)$: SIMBAD database, operated at CDS, Strasbourg, France.
\end{table}