Model fitting of the kinematics for knot i: trajectory Zn-Xn, core separation rn(t), coordinates Xn(t) and Zn(t), the modeled apparent velocity/viewing angle and Lorentz/Doppler factor. The initial acceleration is apparent (from ~6.8c to ~14c). In the upper plots, two additional model (red and green) curves calculated for ejection epochs t0 + 0.3 yr and t0−0.3 yr are shown, indicating that most of the observational data points are within the regions confined by the two curves and that the precession period is determined with an uncertainty of ~0.3 yr.
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