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Table 5:

Characteristics of Orcus models including volatiles.

Reduced $\chi ^2$a Depth (%)b
Model 2 72 -
2% CO2 73 5
5% CO2 74 11
10% CO2 76 21
2% CH4 72 2
5% CH4 73 5
10% CH4 80 10

Notes. (a) The $\chi ^2$ is weighted to give greater importance to locations where absorption bands exist (H2O bands) and lower importance to regions affected by telluric absorption. The value compares the model to the near-infrared data from Barucci et al. (2008). (b) The percentage depth of the strongest CO2 band at 2.012 $\mu $m and the CH4 band at $\sim$2.2 $\mu $m relative to the continuum for each model.

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