Top: maximum distance R_max(z) from the precession axis reached by the jet material, at various times. Middle: distance R_j(z) from the precession axis of the jet beam axis, at the same times. Bottom: fit of R_j(z) for t = 29.25 years. The dashed line represents a precessing angle of 20°. The two continuous lines fits a ax+b function between the transition region (z = 0.07 pc) and the position where the jet gets deflected (z = 0.17 pc). The curve is fit for the negative z with 9.8° and the positive z with 11.6° precessing angles.