\begin{table}%t1
\caption{Comparison of the central wavelength (in micron) of methane~ice bands measured in our spectrum of Eris (left column) with the position of the same bands reported from laboratory experiments for the two~cases of pure (middle column) and diluted (right column) methane ice.} 
\label{wavelengthshifts} 
\small%\centerline
{
\begin{tabular}{lcc}
\hline \hline
Data & Pure $\rm CH_{4}$$^a$  &  Diluted $\rm CH_{4}$ $^{a}$\\
\hline
1.484 $\pm$ 0.001& 1.4850 & -- \\
1.656 $\pm$ 0.001& 1.6575 & -- \\
1.671 $\pm$ 0.001& 1.6697 & 1.6657 \\
1.689 $\pm$ 0.001& 1.6894 &  none  \\
1.723 $\pm$ 0.001& 1.7242 & 1.7198 \\
1.787 $\pm$ 0.001& 1.7873 & -- \\
1.797 $\pm$ 0.001& 1.7967 & 1.7921 \\
1.856 $\pm$ 0.001& 1.8576 & -- \\
1.938 $\pm$ 0.001& 1.9374 & -- \\
2.207 $\pm$ 0.003& 2.2077 & 2.2024 \\
2.377 $\pm$ 0.004& 2.3789 & 2.3729 \\
\hline
\end{tabular}}
\medskip
$^a$ Quirico \& Schmitt (\cite{qui97}).
\end{table}