Composition profile for the H-rich, red supergiant star explosion model s15p2 at 350 d. We show the variation of the mass fraction versus Lagrangian mass in the inner 5 M_⊙ for species H, He, C, O, Ne, Mg, S, Ar, Fe, and Ni (with ⁵⁸Ni shown as a thick dashed line) – these abundances account for radioactive decay where appropriate. The thin dashed line corresponds to the velocity profile (see y-axis at right).