\begin{table}%t6
\caption{Comparison of masses and gravities derived from the evolutionary tracks and from quantitative analysis of the spectra. The quoted log~$g_{\rm evol}$~values are given corrected to two~decimal places to be consistent with the corresponding evolutionary masses. Note, however, that these are not an~indication of the precision of these values, which we consider to be 0.1~dex.}
\label{t_masas}
%\centering
\par
\begin{tabular}{c c c c c}    
\hline
\hline
 Star & $M_{\rm spec} $ ($M_{\odot}$) &  $M_{\rm evol} $ ($M_{\odot}$) &
 log~$g~_{\rm spec}$ & log~$g~_{\rm evol}$\\
\hline
 $\theta^1$ Ori A   & 14 &  15  & 4.0 &  4.03 \\
 $\theta^1$ Ori C   & 45 &  33  & 4.1 &  3.98 \\
 $\theta^1$ Ori D   & 18  & 16  & 4.2 &  4.16 \\
 $\theta^2$ Ori A   & 39  & 22  & 4.1 &  3.97 \\
 $\theta^2$ Ori B   & 9  & 13  & 4.1 &  4.26 \\
 10~Lac                & 20 &  25 &  3.9 &  4.02 \\
 15~Mon               & 40 & 34  & 4.1  &  4.05\\
 $\tau$~ Sco        & 11 &  16 &  4.0  &  4.16 \\
\hline
\end{tabular}
\end{table}