Fig. 4
Division of the normalized spectra presented in Fig. 3. N1, N2, N3, Nold refer to spectra obtained on July 17th 2014 (SEEL = 41°), July 22th 2014 (SEEL = 121°), August 17th 2014 (SEEL = 101°), and April 13th 2008 (SEEL = 5°), respectively. Synthetic spectra of water ice and methane ice have been added (in purple and red dashed lines, respectively).
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