Fig. 4
Top figure: SpeX spectra of the three outermost moons of Uranus (Grundy et al. 2006) showing increasing abundance of CO2 ice with decreasing planetocentric distances. Bottom figure: our PHARO and SpeX spectra (without the H-band spectra of 2000-08-13 due to some contamination by Uranus). The vertical solid lines represent the positions of the CO2 bands (including a forbidden band).
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