\begin{table}%t3
\caption{\label{table erosion}Percentage destruction for carbonaceous grains in shocks.}
\small%\centerline
 {
\begin{tabular}{l c c c c c cc}         
\hline\hline                   
&&&&&&& \\[-8pt]
$V_{\rm S} ~(\rm km~s^{-1})$ & 50 & 75 & 100 & 125 & 150 & 175 & 200 \\     
\hline  
\multicolumn{7}{l}{No fragmentation}  \\
JTHM94 & 1.1 & -- & 11.5 & -- & 20.5 & -- & 29 \\       
This work & 3.6 & 22.2 & 36.2 & 59.7 & 58.5 & 76.8 & 100    \\
\hline
\multicolumn{7}{l}{Fragmentation included}  \\
JTH96 & 1.1 & -- & 7.0 & -- & 12.4 & -- & 46.7 \\
This work  & 3.8 & 21.4 & 31.3 & 56.1 & 57.7 & 80.9 & 100 \\
\hline                                     
\end{tabular}}
\medskip
Note. Graphite/amorphous carbon grains without fragmentation (JTHM94, \citealt{jones94}) and with  
fragmentation (JTH96, \citealt{jones96}). Results for a-C:H (This work).
\end{table}