\begin{table}%t7
\caption{Calculated values for $kN$ (s$^{-1}$) for rough amorphous carbon grains.}\label{k N carbon}
%\centering
\small
\begin{tabular}{l c c c c c c c }\hline \hline
 $f/f_{0}$  &  10 K & 15 K & 20 K & 25 K & 30 K   & 35 K & 40 K \\ \hline 
1  &  7.6E-11 & 2.5E-8  & 7.8E-8 & 3.1E-7   & 2.9E-6    & 7.0E-04 &7.3E-02       \\ 
2  &  7.7E-11 & 4.5E-8  & 1.3E-7 & 5.1E-7   & 3.7E-6    & 6.9E-04 & 6.9E-02       \\ 
3  &  7.7E-11 & 6.5E-8  & 1.9E-7 & 6.7E-7   & 4.4E-6   & 7.3E-04 & 7.0E-02      \\ 
4  &  7.7E-11 & 8.4E-8  & 2.4E-7 & 8.3E-7   & 5.0E-6    & 7.1E-04 & 7.0E-02     \\ 
5  &  7.8E-11 & 1.0E-7  & 2.8E-7 & 9.7E-7   & 5.7E-6    & 7.1E-04 & 7.4E-02       \\
6  &  7.7E-11 & 1.2E-7  & 3.1E-7 & 1.1E-6   & 6.3E-6    & 7.2E-04 & 7.8E-02        \\
7  &  7.5E-11 & 1.4E-7  & 3.8E-7 & 1.3E-6   & 6.9E-6   & 7.1E-04  & 7.6E-02      \\ 
8  &  7.8E-11 & 1.6E-7  & 4.2E-7 & 1.4E-6   & 7.4E-6   & 7.2E-04 & 7.4E-02       \\ 
9  &  7.5E-11 & 1.8E-7  & 4.7E-7 & 1.5E-6   & 8.0E-6    & 7.3E-04 & 7.5E-02       \\ 
10 &  7.7E-11 & 2.0E-7  & 5.2E-7 & 1.6E-6   & 8.7E-6   & 7.2E-04 & 7.7E-02      \\ 
15 &  7.9E-11 & 3.0E-7  & 7.4E-7 & 2.3E-6   & 1.1E-5    & 7.4E-04  & 7.6E-02      \\ 
20 &  7.7E-11 & 4.0E-7  & 9.6E-7 & 2.9E-6   & 1.4E-5   & 7.7E-04  & 7.4E-02       \\ 
25 &  7.9E-11 & 4.9E-7  & 1.2E-6 & 3.5E-6   & 1.7E-5  & 7.7E-04  & 7.7E-02     \\ 
30 &  7.9E-11 & 5.9E-7  & 1.4E-6 & 4.1e-6   & 1.9E-5   & 7.9E-04 & 7.8E-02      \\ \hline
   \end{tabular}
\end{table}