\begin{table}%t1
\caption{\label{tab.estcal}Stars used in the Mg \scriptsize{II} \normalsize --
and the index  {\it S} calibration. }
%\centering
\par
\begin{tabular}{r c r r r}
\hline\hline
Stars &  Spectral &       &      & $T_{\rm eff}$\\
 HD &   class and &  $m_V$& $B-V$    & (K)\\
    &   type      &       &        &    \\
\hline 
  1835 & G3V & 6.39 & 0.66 & 5675\\
 10~700 & G8V & 3.50 & 0.72 & 5500\\
 17~925 & K0V & 6.04 & 0.87 & 5170\\
 20~630 & G5V & 4.83 & 0.68 & 5610\\
 22~049 & K2V & 3.73 & 0.88 & 5140\\
 26~965 & K1V & 4.43 & 0.82 & 5295\\
101~501 & G8V & 5.33& 0.72 & 5500\\
115~404 & K3V & 6.52 & 0.94 & 4990\\
131~156 & G8V & 4.72 & 0.72 & 5500\\
149~661 & K0V & 5.75 & 0.82 & 5295\\
152~391 & G8V & 6.64 & 0.76 & 5295\\
\hline
\end{tabular}
\par
\end{table}