\begin{table}%[ht]%T3
%\centering
\par
\caption{Some values of the inelastic cross section and the
       associated spallation scale length.}
       \begin{tabular}{cccc}   \hline\hline
          & $p$  & O  & Fe  \\
          \hline
          $\sigma~(\mbox{mb})$ & 44 & 309 & 760\\
          $r_{\rm sp}~(\mbox{kpc})$, 1 GeV/nuc & 10.2 & 1.45 & 0.59\\
          $r_{\rm sp}~(\mbox{kpc})$, 100 GeV/nuc & 115 & 16.4 & 6.7\\
          \hline
       \end{tabular}
       \end{table}