Illustration of ejecta and radiation properties for the shuffled-shell models he3p3 and he8p0. From the upper to the lower panels, we show the profiles versus velocity for the mass fraction of He, O, Ca, and Fe (including the volume integral of the decay power absorbed normalized to unity; dashed line), their ionization state (zero for neutral, one for once ionized, etc.; we also include N and Ni), and the formation regions for [O I] λ 6364, [N II] λ 6548, [Ca II] λ 7291, [Ni II] λ 7378, [Fe III] λ 4658, and Fe IIλ 5169. The latter shows how the emission varies with velocity in a selection of lines. For better visibility, this emission ξ is normalized so that its maximum is set to unity (and the quantity is then named ). Quantitatively, the line equivalent width EW is related to ξ through the relation EW = ∫ξ d log V.