Full shell width W(z) at t = 700 yr as a function of altitude z for the models in Table A.l, with jet densities 100 times smaller than in Fig. 4. Colored curves have one parameter varied from the reference run, among the ambient core base density, ρ_a0, jet semi-opening angle ,θj, initial jet base density, ρ_j0, semi-amplitude of variability, ΔV, period, P, type of variability profile (sawtooth instead of sinusoidal), or jet radius, Rj.