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With the collection of six years of MGS tracking data and three years of Mars Odyssey tracking data, there has been a continual improvement in the JPL Mars gravity field determination. This includes the measurement of the seasonal changes in the gravity coefficients (e.g., J¯2, J¯3, C¯21, S¯21, C¯31, S¯31) caused by the mass exchange between the polar ice caps and atmosphere. This paper describes...
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