\begin{table}%t4
\caption{Best fitting model, model without N$_2$, model with 10\% N$_2$.}\label{tab03}
   %\centering
\par
   \small
\begin{tabular}{l c c c l}
\hline\hline\noalign{\smallskip}
 & Best Model &  No N$_2$  model &  10\% N$_2$  model & Reference$^{e}$\\
\hline
rms$^{a}$	&$1.1\times10^{-4}$ &	$1.8\times10^{-4}$ &	$1.6\times10^{-4}$ & -- \\	
Titan tholin $^{b}$&	0.12 &	0.09 &	0.11 &	(1) \\
Triton tholin $^{b}$&	0.06 &	0.05 &	0.04 &	(2) \\
Triton tholin $^{c}$&	0.03 &	0.05 &	0.04 &	(2) \\
H$_2$O amorph (40 K) $^{d}$ &	0.18(1.3 $\mu$m) &	0.29(1.5 $\mu$m) &	0.22(1.8 $\mu$m) &	(3) \\
Titan tholin $^{d}$ &	0.13(11.2 $\mu$m) &	0.14(11.8 $\mu$m) &	0.13(12.0 $\mu$m) &	(1) \\
H$_2$O cryst (40 K) $^{d}$ &	0.18(14.6 $\mu$m) &	0.24(11.0 $\mu$m) &	0.23(11.4 $\mu$m) &	(3) \\
C$_2$H$_6$ $^{d}$ &	0.04(6.5 $\mu$m) &	0.04(8.4 $\mu$m) &	0.04(8.8 $\mu$m) & (4) \\
Triton tholin $^{d}$ & 0.14(7.4 $\mu$m) &	0.15(6.8 $\mu$m) &	0.14(7.6 $\mu$m) &	(2) \\
N$_2$ (36--60 K) $^{d}$ &	0.20(16.1 mm) &	0(16.0 mm) &	0.1(15.8 mm) &	(5) \\
CH$_4$ (30--35 K) $^{d}$ &	0.13(9.4 $\mu$m) &	0.14(7.1 $\mu$m) &	0.16(8.4 $\mu$m) &	(6), (7) \\
\hline
\end{tabular}
\begin{list}{}{}
\item[$^{a}$] rms error of each model when compared to the data. 
\item[$^{b}$] Material  mixed as inclusions in CH$_4$ ice. 
\item[$^{c}$] Material mixed as inclusions in crystalline H$_2$O ice. 
\item[$^{d}$] Material mixed intimately, with grain size in parenthesis. Temperature listed after the name of the component.
\item[$^{e}$] References. (1) Imanaka et~al. (\cite{ima05}); (2) Khare et~al. (\cite{kha94}); (3) Mastrapa \& Sandford (\cite{massand08}); (4) Mastrapa (private comm);
(5) Green et~al. (\cite{gre91}); (6) Grundy et~al. (\cite{gru02}); (7) Hudgins et~al. (\cite{hudg93}).\\
\hspace*{-2.5mm}N.B.: All models were computed with a porosity of ~0.1.
\end{list}
\end{table}