\begin{table}%t3
\caption{\label{tab:gravity_det}The gravity determination.} 
\par
%\centering
\par
\small\begin{tabular}{lc cc cc cc}
\hline\hline
   & T183  &  T191  & T193 &\multicolumn{2}{c}{B652} & B2151 & B2206\\
\multicolumn{1}{r}{$V$} & 13.881& 13.954& 13.963& 14.70 & 14.743          & 14.45 & 14.30\\ 
\teff{} & \multicolumn{7}{c}{\logg}\\
\hline
\noalign{\smallskip}
11~000   &  3.71 &  3.74 &  3.74 & 3.89 & 3.91 &3.79   & 3.73 \\
11~500   &  3.75 &  3.78 &  3.78 & 3.93 & 3.94 &3.83   & 3.77\\
12~000   &  3.78 &  3.81 &  3.81 & 3.96 & 3.98 &3.86   & 3.80\\
12~500   &  3.81 &  3.84 &  3.85 & 3.99 & 4.01 &3.89   & 3.83\\
average \logg: & $3.76\pm0.04$  &   $3.79\pm0.04$   &  $3.79\pm0.04$   &  $3.94\pm0.04$  &   $3.96\pm0.04$    & $3.84\pm0.04$   &    $3.78\pm0.04$   \\
\hline
\end{tabular}
\end{table}