\begin{table}%t3
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\par
\caption{Solar $r$-process fractions~$f_{\rm r}$ for various elements~$X$.\label{rfraction}}
\begin{tabular}{lll}
%
\hline\hline
\noalign{\smallskip}
$X$ & $f_{\rm r}$ & Reference\\
\noalign{\smallskip}
\hline
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Eu & 0.942 & \citet{arlandini99}\\
Hf & 0.566 & \citet{lawler07}\\
Os & 0.92 & \citet{simmerer04}\\
Ir & 0.99 & \citet{simmerer04}\\
\hline
\end{tabular}\vspace*{3.5mm}
\end{table}