Fig. 7

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Quadrupole model of the orbits 1, 2, and 3 with χ2 = 1084 over the time-span of 1707 days. The orbits are plotted in the (u; υ) coordinates (green, blue and pink lines, respectively), together with observed positions (black crosses) and residuals (red, orange and yellow lines, respectively). Elektra’s shape for one of the epochs is overplotted in black.
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