Maps of hydrogen nuclei density n_H from simulations of the same cylindrical jet as in Lee et al. (2001) (see Table 1). The three columns confront three different ambient core stratifications, and the two rows show the map at two ages t = 296 yr (top) and 610 yr (bottom). The jet is launched in Figs. 1a and d through a uniform ambient core with profile ρ(R, z) = ρ_α0; in Figs. 1b and e through an z-stratified ambient core ρ(R, z) = ρ_α0/(1 + z/z_c)² with z_c = 10¹⁶cm; and in Figs. 1c and f through a flattened singular core ρ(r, θ) = ρ_a0 sin² θ(r₀/r)², where r is the spherical radius and r₀ = 2.5 × 10¹⁵ cm. All core density profiles have the same base density at R = R_j, ρ_α0 = 1.6 × 10^—20 g cm^–3, density-matched with the jet at t = 0. W note how the jet-driven shell expands faster and wider through an increasingly stratified core, whereas the nested shells also grow wider.