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The data used in this study will be deposited with the NASA Planetary Data System (http://pds-geophys. wustl.edu/pds/) 1 October 1999. We gratefully acknowledge P. Priest, S. Abbate, S. Asmar, and M. Connally for the observations; G Neumann, S. Fricke, and D. Yuan for data analysis; and R. Simpson and J. Twicken for data assessment and archiving. We thank the MCS spacecraft and operation teams at JPL and Lockheed-Martin Astronautics in the management of the MGS mission and M. Zuber for stimulating and helpful discussions regarding the interpretation. This investigation was supported by the NASA Mars Global Surveyor Project
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