\begin{table}%t1
\caption{\label{tab:regs}The 5 regions with massive stars in Orion.}
%\centering
\par
\begin{tabular}{lcccccc}
\hline\hline \noalign{\smallskip}
Association & Stars ${>}2~M_{\odot}$   & Age (rotating) & Age (non-rotating) & $M_{\rm up}$ & Stars ${>}M_{\rm up}$  &  Distance\\ 
\hline
OB1a & 160 &  12 Myr & 10 Myr & 18.5 & 7.3 & 330\\
OB1b & 120 &  5.5 Myr &  4.6 Myr & 45 & 1.3 & 360\\
OB1c & 140 &  5.5 Myr &  4.6 Myr & 45 & 1.5 & 400 \\
OB1d & 60 &   1 Myr & 1 Myr & 120 & 0 & 410\\
$\lambda$ Ori & 60 & 5.5 Myr & 4.6 Myr & 45 & 0.65 & 450\\
\hline
\end{tabular}
\tablefoot {Given are the estimated number of stars above 2~$M_{\odot}$, the age for rotating and non-rotating models, the highest mass possible mass for stars at these ages, the estimated number of stars that has already exploded as supernovae and the distance.}
\end{table}