\begin{table}%t2
\caption{\label{tab2}Shape and lattice distortion of each sample.}
%\centering
\par
\begin{tabular}{ccc} \hline\hline
 & Shape & Lattice distortion \\\hline 
Hand-milled & Irregular with sharp edges & Very small \\
Ball-milled & Rounded & Large \\
Annealed & Rounded & Small (relaxed) \\\hline
\end{tabular}
\end{table}