This article has an erratum: [https://doi.org/10.1051/0004-6361/201425015e]
Top: maximum distance Rmax(z) from the precession axis reached by the jet material, at various times. Middle: distance Rj(z) from the precession axis of the jet beam axis, at the same times. Bottom: fit of Rj(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.
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