\begin{table}%t1
\caption{Optimum FPM diameter (and hence APLC characteristics) for several obscuration sizes and criteria.}\label{obscuration}
%\centering
\small
\begin{tabular}{c|cc|cc}
\hline \hline
&\multicolumn{2}{c|}{$C_{\mathscr{C}}$ }  & \multicolumn{2}{c}{Max. throughput} \\
Obstruction size (\%) &  FPM ($\lambda/D$) & Throughput ($\%$) &  FPM ($\lambda/D$) & Throughput ($\%$) \\
\hline
10         &  4.3  &  59.4&    4.1  & 62.2 \\
15 	&  4.3  & 58.3 &    4.0   &62.4  \\ 
20 	&  4.4  & 55.8&   3.8   & 65.5 \\
25 	&  4.6  & 52.7&    3.6   & 67.9\\
30 	&  4.7 & 51.2&    3.5   & 68.7\\
35 	&  4.9  & 49.4&    3.3   & 70.4 \\
\hline
\end{tabular}
\end{table}