\begin{table}%t1
%\centering
\par
\caption{The radius of the best fit homogeneous sphere, $r_{\rm f}$ ({\it left columns}), and the radius of the best fit porous sphere, $r_{\rm p}$ ({\it right columns}), in $\mu$m for the absorption spectra of the Gaussian random spheres and the fractal aggregates. \label{tab:fit parameters rf}}
\begin{tabular}{ccccccccccccccccc}
\hline\hline
		& \multicolumn{8}{c}{Homogeneous spheres}&\multicolumn{8}{c}{Porous sphere approximation}\\
		& \multicolumn{4}{c}{\footnotesize Gaussian random spheres}&\multicolumn{4}{c}{\footnotesize Fractal aggregates}
		& \multicolumn{4}{c}{\footnotesize Gaussian random spheres}&\multicolumn{4}{c}{\footnotesize Fractal aggregates} \\
		&	$\sigma$&	$\sigma$&	$\sigma$&	$\sigma$&	$D_{\rm f}$	&	$D_{\rm f}$	&	$D_{\rm f}$	&	$D_{\rm f}$
		&	$\sigma$&	$\sigma$&	$\sigma$&	$\sigma$&	$D_{\rm f}$	&	$D_{\rm f}$	&	$D_{\rm f}$	&	$D_{\rm f}$\\
		&	$0.1$&	$0.3$&	$0.5$&	$0.7$&	$2.8$	&	$2.4$	&	$1.8$	&	$1.2$
		&	$0.1$&	$0.3$&	$0.5$&	$0.7$&	$2.8$	&	$2.4$	&	$1.8$	&	$1.2$\\
\hline
$r_V=0.4~\mu$m	&	$0.8$   &	  $1.2$   &     $1.3$	&	$1.3$   &	  $0.4$   &     $0.4$	&	$0.4$   &	  $0.4$ &	  $1.0$   &     $2.9$	&	$5.8$   &	  $8.0$   &     $0.4$	&	$0.4$   &	  $0.4$   &     $0.4$\\
$r_V=1.0~\mu$m	&	$1.2$   &	  $1.4$   &     $1.5$	&	$1.5$   &	  $1.2$   &     $1.1$	&	$1.3$   &	  $1.3$ &	  $1.2$   &     $4.5$	&	$8.6$   &	  $11.1$  &     $2.1$	&	$2.1$   &	  $3.8$   &     $12.8$\\
$r_V=2.0~\mu$m	&	$2.0$   &	  $1.9$   &     $1.8$	&	$1.7$   &	  $2.0$   &     $1.8$	&	$1.5$   &	  $1.4$ &	  $3.9$   &     $9.9$	&	$15.8$  &	  $17.9$  &     $5.1$	&	$5.8$   &	  $13.0$  &     $122.2$\\
$r_V=4.0~\mu$m	&	$3.7$   &	  $3.1$   &     $2.5$	&	$2.1$   &	  $3.8$   &     $2.2$	&	$1.6$   &	  $1.4$ &	  $9.2$   &     $21.6$  &	$30.1$  &	  $31.2$  &     $11.8$  &	$11.6$  &	  $36.9$  &     $1101.7$\\
$r_V=6.0~\mu$m	&	$5.1$   &	  $3.8$   &     $3.1$	&	$2.6$   &	  $5.8$   &     $2.4$	&	$1.7$   &	  $1.5$ &	  $13.6$  &     $30.4$  &	$41.6$  &	  $40.1$  &     $14.6$  &	$16.4$  &	  $76.2$  &     $4391.8$\\
\hline
\end{tabular}
\end{table}