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. 2018 Mar 14;4(3):e1701645. doi: 10.1126/sciadv.1701645

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 5 — (A) Water ice, (B) Na₂CO₃, and (C) hydrated sodium carbonate (Na₂CO₃·H₂ONa₂CO₃·H₂O). Mass fraction abundances are derived from the spectral fitting method (table S2). The lower panels show the spectral fit (red curve) of select pixels in Oxo using (D) ammonium montmorillonite, dolomite, dark material, and natrite (Na₂CO₃) excluding and (E) including Na₂CO₃·H₂O. Error bars are calculated according to calibration uncertainties and Poisson noise (41).