\begin{table}%t3
\caption{Summary of the results for albedo $A$ and polarization~$P$ with wavelength-independent refractive index ($m=n+{\rm i}~k$) for aggregates of 128~monomers with radius ${a}_{{\rm m}}=100$~nm $^{{a}}$.}\label{tbl4}
%\centerline
$${
\begin{tabular}{lccc}
\hline
\hline
\backslashbox{$n$}{$k$} & 0.0--0.2 & 0.4--0.6 & 0.8--1.0 \\
\hline
1.4--1.6          &-- &$A_{\theta} P_{\theta \lambda}$ &$A_{\theta} P_{\theta \lambda}$\\
\hline
1.8--2.0 &$P_{\lambda}$ &$A_{\theta \lambda} P_{\theta \lambda}$ &$A_{\theta} P_{\theta \lambda}$\\
\hline
\end{tabular}}
$$
\medskip
$^{{a}}$ The subscripts $\theta$ and $\lambda$ denote the successful retrievals of angular and spectral dependences, respectively.
\end{table}