\begin{table}%t7
\caption{\label{supergiants}These stars are classified as M-type supergiants in the SIMBAD, but probably M-type giants.}  
%\centering
\par
\begin{tabular}{l r r r }
\hline\hline \noalign{\smallskip}
Name & $M_{{L18W}}$ & $(V-S9W)$ & $(B-V)$ \\ 
 & \multicolumn{3}{c}{[mag]} \\
\hline
KT Mus       & $-6.94$ & 6.50 & 1.77 \\
HD 306799 & $-4.85$ & 4.60 & 1.85 \\
RV Pup       & $-5.70$ & 6.79 & 1.41 \\
V408 Aur    & $-6.08$ & 5.45 & 1.79 \\
NSV 25773 & $-5.49$ & 4.40 & 1.69 \\
KN Cas       & $-3.08$ & 5.65 & 1.57 \\
\hline
\end{tabular}
\end{table}