Deviations of kinematical parameters of the dynamical jets from those of the ballistic jets in dependency on the flight-time. Along the left axis, thick and thin solid red lines: tangential deceleration a_τ(t), in units of c/P_pr, and relative decrement δv_j(t) of the jet velocity, respectively. Along the right axis, thick and thin dotted blue lines: transverse Δy(t) and longitudinal −Δz(t) deviations, respectively, of the dynamical jet loci in the comoving frame of reference of the ballistic jet, in units of mas; thick and thin dashed black lines: increment of azimuth Δψ(t) of the precession rotation, in units of a tenth of a degree, and increment Δθ_pr(t) of the precession cone semi-opening, in units of a hundredth of a degree, respectively. This figure is available in colour in the on line version of this paper.