\begin{table}%t1
\caption{\label{tab1}Peak positions of each band for each samples (in $\mu$m).}
%\centering
\par
\begin{tabular}{ccccccc} \hline\hline
 & \multicolumn{1}{c}{Hand-milled} & 
 \multicolumn{1}{c}{\textit{FWHM}} & 
 \multicolumn{1}{c}{Ball-milled} & 
 \multicolumn{1}{c}{\textit{FWHM}} & 
 \multicolumn{1}{c}{Annealed} & 
\par
 \multicolumn{1}{c}{\textit{FWHM}} \\  \hline 
10.1 $\mu$m & 10.11  &  & 10.06  &  & 10.03  &  \\
10.4 $\mu$m & 10.47  &  & 10.46  &  & 10.46  &  \\
11.3 $\mu$m & 11.30  &  & 11.25  &  & 11.29  &  \\
12 $\mu$m & 11.91  &  & 11.89  &  & 11.91  &  \\
16 $\mu$m & 16.45  & 0.81  & 16.44  & 1.12  & 16.38  & 0.66  \\
20 $\mu$m & 19.79  &  & 19.59  &  & 19.55  &  \\
24 $\mu$m & 24.15  & 2.46  & 23.90  & 2.61  & 23.92  & 2.33  \\
26 $\mu$m & 26.46  &  & 26.39  &  & 26.39  &  \\
27 $\mu$m & 27.73  &  & 27.58  &  & 27.66  &  \\
34 $\mu$m & 34.06  & 2.66  & 33.73  & 2.92  & 33.84  & 2.72  \\
50 $\mu$m & 50.5  &  & 50.3  &  & 50.4  &  \\
70 $\mu$m & 73.2  & 2.1 & 72.6  & 3.6 & 72.5  & 2.5 \\ \hline
\end{tabular}
\end{table}