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Results of spatial and spectral analyses of South Ray, Tycho, Tsiolkovsky and Orientale. M Ohtake et al. Nature 461 , 236 - 240 (2009) doi:10.1038/nature08 317.
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Results of spatial and spectral analyses of South Ray, Tycho, Tsiolkovsky and Orientale. M Ohtake et al.Nature461, 236-240 (2009) doi:10.1038/nature08317