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During three of them, radio tracking data were collected during the closest approach, allowing estimation of the full degree-2 gravity field by precise spacecraft orbit determination.\n  The gravity field of Dione is dominated by $J_{2}$ and $C_{22}$, for which our best estimates are $J_{2} \\times 10^6 = 1496 \\pm 11$ and $C_{22} \\times 10^6 = 364.8 \\pm 1.8$ (unnormalized coefficients, 1-$\\sigma$ uncertainty). 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