Contribution of individual elements within the model ejecta to the flux at each wavelength. Element fluxes are calculated based on their contribution to the opacity bin with which escaping Monte Carlo packets experienced their last interaction. Spectra are shown for our fiducial model (left) and our model that includes an additional ⁵⁶Ni shell of 0.03 M_⊙ and width of 0.06 M_⊙ (right). Spectra are also shown for 1.50 d after explosion, binned to Δλ = 15 Å (top), and 18.75 d after explosion, binned to Δλ = 10 Å (bottom).