\begin{table}%t2
%%\centering

\par
\caption{\label{table2}Total elemental fractional abundances in surface and mantle phases, calculated from Table~\ref{table1} data.}
\begin{tabular}{cccc}
\hline\hline \noalign{\smallskip}
Element&Surface&Mantle&Mantle-to-surface\\
\hline
C&1.35E-05&4.73E-04&3.51E+01\\
N&4.14E-06&1.27E-04&3.07E+01\\
O&2.98E-05&9.35E-04&3.14E+01\\
Na&8.23E-08&2.90E-06&3.53E+01\\
Mg&2.01E-06&6.78E-05&3.38E+01\\
Si&2.95E-06&6.50E-05&2.20E+01\\
S&6.89E-07&2.93E-05&4.24E+01\\
Fe&1.81E-06&5.61E-05&3.10E+01\\
\hline
\end{tabular}
\end{table}