\begin{table}%t1
\par
\caption{The Lorentzian band fitting parameters for the (nano)diamond surface
  C--H stretching vibrations.\label{tab1}}
%\centerline
{\begin{tabular}{cccccc} 
 \hline 
 \hline
 \multicolumn{6}{c}{ }                \\[-0.2cm]
 \multicolumn{1}{c}{Sample}            &
 \multicolumn{2}{c}{Band position}     &
 \multicolumn{1}{c}{$FWHM$}              &
 \multicolumn{1}{c}{Intensity$^a$}     &
 \multicolumn{1}{c}{Band}              \\
 \multicolumn{1}{c}{}                  &
 \multicolumn{1}{c}{$\mu$m}            &
 \multicolumn{1}{c}{cm$^{-1}$}         &
 \multicolumn{1}{c}{$\mu$m}            &
 \multicolumn{1}{c}{}                  &
 \multicolumn{1}{c}{origin$^b$}        \\[0.2cm]
 \hline
 \multicolumn{6}{c}{ }                                      \\[-0.2cm]
 Orgueil &  3.409  &  2933  &  0.014  &  0.520  &  C\{100\} \\
         &  3.425  &  2919  &  0.015  &  0.328  &  C\{100\} \\
         &  3.442  &  2905  &  0.022  &  0.254  &  CH$_x$   \\
         &  3.490  &  2865  &  0.023  &  0.329  &  CH$_x$   \\
         &  3.508  &  2850  &  0.034  &  1.000  &  CH$_x$   \\
         &  3.533  &  2830  &  0.019  &  0.252  &  C\{111\} \\[0.2cm]
% \hline
% \multicolumn{6}{c}{ }                                      \\[-0.2cm]
% 5 nm    &  3.400  &  2941  & data  & to    & be  \\
% (G)     &  3.486  &  2869  & added & to    & the \\
%         &  3.522  &  2839  & table & later.&     \\[0.2cm]
 \hline
 \multicolumn{6}{c}{ }                                      \\[-0.2cm]
 5 nm    &  3.399  &  2941  &  0.013  &  0.718  &  C\{100\} \\
         &  3.417  &  2926  &  0.013  &  0.324  &  C\{100\} \\
         &  3.443  &  2904  &  0.024  &  0.145  &  CH$_x$   \\
         &  3.484  &  2870  &  0.022  &  1.000  &  CH$_x$   \\
         &  3.504  &  2854  &  0.018  &  0.454  &  CH$_x$   \\
         &  3.520  &  2840  &  0.010  &  0.275  &  C\{111\} \\[0.2cm]
 \hline
 \multicolumn{6}{c}{ }                                      \\[-0.2cm]
 100 nm  &  3.398  &  2942  &  0.009  &  0.106  &  C\{100\} \\
         &  3.412  &  2931  &  0.006  &  0.173  &  C\{100\} \\
         &  3.428  &  2917  &  0.004  &  0.100  &  CH$_x$   \\
         &  3.499  &  2858  &  0.011  &  0.337  &  CH$_x$   \\
         &  3.513  &  2846  &  0.005  &  0.237  &  CH$_x$   \\
         &  3.529  &  2833  &  0.007  &  1.000  &  C\{111\} \\[0.2cm]
 \hline
 \multicolumn{6}{c}{ }                                      \\ 
\end{tabular}}
\par
 $^a$ N.B. the intensity given here is normalised to that of         
 the strongest band in each (nano)diamond sample.   
\par
 \smallskip                 
 $^b$ C\{111\} (C\{100\}) indicates C--H stretching on the           
 C\{111\}-$1\times 1$ (C\{100\}) surface, and CH$_x$ ($x=1$--3)       
 indicates C--H stretches on corners, edges, defects,                
  etc. (e.g., \cite{Chang_1995}; \cite{Chen_2002}).                          
\par
\end{table}