Two-dimensional density structure (left) for a clumped model set-up over a 90° wedge (in our HERACLES simulations, this wedge straddles the equatorial plane at θ = π/2 and thus extends from θ = π/4 to θ = 3π/4). The black line corresponds to the photosphere. Quantities other than density vary only with radius initially. The plot on the right shows the velocity in units of 1000 km s⁻¹ (V₈), the temperature in units of 10⁴ K (T₄), the normalized smooth density in the log, the radial variation of clumping (ξ), and the normalized ⁵⁶Ni distribution versus radius R. The model corresponds to the case of a 20 d old type II-P SN ejecta with the following model parameters: M_ej = 12 M_⊙, E_kin = 1.2 × 10⁵¹ erg, k = 9, T_high = 50 000 K, T_low = 100 K, R_T = 7 × 10¹⁴ cm, ΔR_T = 3 × 10¹⁴ cm, σ_cl = 0.02, ξ₀ = 0.1, V_cl = 4000 km s⁻¹, ΔV_cl = 3000 km s⁻¹, M(⁵⁶Ni) = 0.05 M_⊙, V_Ni = 2000 s⁻¹, and ΔV_Ni = 1000 km s⁻¹.