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Fig. A.1


Apparent distance measurements during a mutual approximation (blue dots on top panels). The polynomial used to fit these observations is typically a fourth order one (left panel). A second order polynomial was also tested, for the whole duration of the event (middle panels) and over a reduced time interval (30 min) centred on the central instant tc. For each of the three case, the residuals between the fitted polynomial and the true apparent distance history are displayed in the bottom panels.

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