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Fig. 10

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(Top) Measured coordinate offsets with respect to the a priori trajectory, supplied by ESOC. The X-offset is shown in blue, Y-offset  −  in red. X and Y are approximately RA and Dec. The measurement sampling  −30 s, 1 km corresponds to  ≈1.1 mas at the distance of 1.24 AU. (Bottom) Error scatter plots; the light blue ellipses show the a priori estimates of the trajectory accuracy, red ellipses – our measurement’s 3σ scatter for a full time-range (left) and best-calibrated time range (right).

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