\begin{table}%T1
%\centering
\par
\caption{Composition of the magnesium silicate samples used for reflection
measurements derived by EDX measurements in the SEM and~TEM.}
\label{compo}
\begin{tabular}{cccc}
\hline\hline
Sample name           & MgO        & SiO$_2$      & Me--OH    \\
                      & \multicolumn{3}{c}{wt\%}            \\
\hline
Mg$_{0.7}$SiO$_{2.7}$ &  31.12     &  67.74       &    0.87 \\
Mg$_{1}$SiO$_{3}$     &  39.79     &  59.07       &    1.14 \\
Mg$_{1.5}$SiO$_{3.5}$ &  50.31     &  48.71       &    0.98  \\
Mg$_{2}$SiO$_{4}$     &  56.45     &  42.33       &    1.22  \\
Mg$_{2.4}$SiO$_{4.4}$ &  61.34     &  37.89       &    0.77  \\
\hline
\end{tabular}
\end{table}