\begin{table}%t7
\caption{\label{table.earlytype}Early-type stars in $\sigma$~Orionis detected with HRC-I/{\em
      Chandra}.}   
        %%\centering
\par
         \begin{tabular}{lll l}
            \hline
            \hline
            \noalign{\smallskip}
No.	& Name				& Alternative		& Spectral 	\\
	&				& name   		& type		\\
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
1	& Mayrit AB			& $\sigma$~Ori~AB + ``F''& O9.5V + B0.5V + ? \\
3	& Mayrit 42062 AB		& $\sigma$~Ori~E	& B2Vpe + K--M:	\\
10	& \object{Mayrit 306125} AB	& HD 37525 AB		& B5Vp + B--A: 	\\
34	& \object{Mayrit 189303}	& HD 294272 B		& B8V	 	\\
53	& \object{Mayrit 524060}	& HD 37564		& A8V:	 	\\
70	& \object{Mayrit 13084}		& $\sigma$~Ori~D	& B2V	 	\\
74	& \object{Mayrit 182305}	& HD 294272 A		& B9.5III	\\
88	& \object{Mayrit 960106}	& V1147 Ori		& B9IIIp	\\
            \hline
         \end{tabular}
   \end{table}