Simulation results corresponding to model 5p0z22.16.1E9 which best-fits the observations of SN 2007on. This DD model simulates the disruption of a WD that explodes with ρ_tr = 1.6 × 10⁷ g cm⁻³ and ρ_c = 1.0 × 10⁹ g cm⁻³ . Left panel:both the density (blue dotted line) and velocity structures (red solid line) are shown vs. mass. Middle panel: element abundances of the most important elements out of 218 isotopes presented in mass fraction (X_i) vs. velocity. The composition of the central region is dominated by numerous iron-group electron capture (EC) isotopes (Hoeflich et al. 1998; Brachwitz et al. 2000). Right panel: variation in the ⁵⁶Ni distribution vs. velocity with ρ_c varied from (0.5−4.0) × 10⁹ g cm⁻³ for a normal-bright SN Ia model (see Diamond et al. 2015).