Modeled relations for knots c, d, h, i, j and k. Top panel: the ejection position angle versus viewing angle with symbol + denoting the jet axis at (−47.2°, 1.5°); Middle panel: the initial position angle swing versus time. Bottom panel: the initial viewing angle versus time. All the curves are obtained from the model fitting of the source kinematics in terms of the precession jet nozzle model.
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