\begin{table}%t2
\caption{Different measurements of $^{60}$Fe flux in units of
$10^{-5}$~ph~cm$^{-2}$~s$^{-1}$~rad$^{-1}$ from the inner Galaxy
and $^{60}$Fe/$^{26}$Al~flux ratio.}\label{table:2}
%\centering
\small
\begin{tabular}{l c c l}
\hline \hline
%&&& \\[-8pt]
 Experiments & $^{60}$Fe flux & $^{60}{\rm Fe}/^{26}{\rm Al}$ & References  \\
\hline
HEAO-3 & $5.3\pm 4.3$ & $0.09\pm 0.08$  & Mahoney et~al. (\cite{Maho82}) \\
SMM & $2.9\pm 2.5$ & $0.1\pm 0.08$    &  Leising \& Share (\cite{Leis94}) \\
OSSE & $6.3\pm 4.5$  &$0.21 \pm 0.15$    &  Harris et~al. (\cite{Harr97}) \\
COMPTEL &  $6.7\pm 5.4$    &  $0.17\pm 0.135$     & Diehl et~al. (\cite{Dieh97})  \\
GRIS & $<$$6.8 (2\sigma)$ & $<$$0.14 (2\sigma)$  & Naya et~al. (\cite{Naya98}) \\
RHESSI &  $3.6\pm 1.4$  & $0.17\pm 0.13$ & Smith (\cite{Smit04})  \\
SPI &  $4.4\pm 0.9$ &  $0.148\pm 0.06$ & this work \\
\hline
\end{tabular}
\end{table}