The final abundances (solid red line) for dynamic simulations (one second duration) of nucleosynthesis from expansion of a chunk of pure iron situated in neutron-rich matter with Y_e = 0.03. Solar abundances are shown as black crosses. For each panel the same initial temperature (4 × 10⁹ K) and density (1 × 10¹¹ g/cc) is used. The left column of panels use an expansion timescale of τ = 0.1 s and for the right column of panels the expansion timescale is τ = 0.001 s. Each row considers a different density profile: top ρ(t) ∝ ⁽t/τ^)-1, middle ρ(t) ∝ ⁽t/τ^)-2, bottom ρ(t) ∝ ⁽t/τ^)-3.