Precession models fitted to the centroids of the blue- (left) and red- (right) shifted lobes of the micro-jets on either side of the jet source at 0″, shown for several emission lines. The [N II]λ centroids in the top panel are sampled from ±90 km s⁻¹ in both lobes; for all other lines the blue-shifted (−30 to −140 km s⁻¹) and red-shifted (+30 to +140 km s⁻¹) lobes are sampled separately. The dashed lines mark the bounds of the successive maxima and minima defined by the half-openingangle β in each case.