Time-resolved spectra at late times. The solid lines are spectra at 0.1 days, and the dashed lines show the spectra at 1 day. Colors represent different models, as in Figure 5. The black dashed line is the Planck function with T = 35,000 K. The observed spectra are quasi-thermal but slightly broader than the Planck function. All models shown are for θ_v = 45°.