Ejecta (gas) temperature and ionisation profiles as a function of velocity for the toy06 model. Left column: Temperature at 15 days (top), 40 days (middle), and 200 days (bottom) post explosion. Right column: mean ionisation of cobalt at 15 days (top), 40 days (middle), and 200 days (bottom) post explosion. We restrict the abscissa range of the ionisation plots to v ≤ 12 000 km s⁻¹ since the Co abundance drops to 0 at larger velocities.