**Table 1:** 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.
Data	Pure $\rm CH_{4}$ ^a	Diluted $\rm CH_{4}$ ^a
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

^a Quirico & Schmitt (1997).

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