\begin{table}%t9
\caption{\label{Tclasses} Definition of classes for $n$-capture-rich stars. In this article we define stars not falling under any of these classes as "normal''.}
%\centering
\par
\begin{tabular}{lll}
\hline
\hline
Class & Constraints in [X/Fe] & Other constraints \\ [0.5ex]
\hline
$r$-I     & $+0.3 \le {\rm [Eu/Fe]} \le +1.0$ & ${\rm [Ba/Eu]} < 0.0$ \\
$r$-II    &          ${\rm [Eu/Fe]} > +1.0$   & ${\rm [Ba/Eu]} < 0.0$ \\
$r+s$     &          ${\rm [Ba/Fe]} > +1.0$   & ${\rm [Ba/Eu]} > 0.0$ \\
        &          ${\rm [Eu/Fe]} > +1.0$   &                          \\ 
$s$       &          ${\rm [Ba/Fe]} > +1.0$   & ${\rm [Ba/Eu]} > 0.0$ \\
        &          ${\rm [Eu/Fe]} \le +1.0$ &                          \\
Pb      &          ${\rm [Ba/Fe]} \ge +1.0$ & ${\rm [Pb/Ba]} \ge +1.0$ \\
\hline
\end{tabular}
\end{table}