Model fitting of the kinematics for knot a: trajectory Zn-Xn, separation rn(t), coordinates Xn(t) and Zn(t), the modeled apparent velocity/viewing angle and Lorentz/Doppler factor. Its ejection time is assumed to be t0 = 1990.0 (corresponding to a phase φ = 1.77 rad). A curvature in its trajectory at Z = 2.0 mas (corresponding to a core separation rn = 0.074 mas) is introduced.
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