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tokens: We are grateful to NASA and their SSERVI node, the Center for Lunar and Asteroid Surface Science at UCF. Special thanks go to our research collaborators: IGEP (Germany) and the Center for Microgravity Research at UCF. This material is based upon work supported by NASA under grant no. NNX09AB85G, issued through the Origins of Solar Systems Program, and grant no. NNA14AB05A, issued through the Solar System Exploration Research Virtual Institute, Space Florida, and by the National Science Foundation under grant no. AST-1413332.