Melt fraction field for a StagYY post-impact simulation featuring case c displayed on Fig. 6. Time is in Myr. The figure illustrates the next 30 Myr of the model’s evolution through the cooling stages of the planet. a) post-impact initial conditions. b) At 382 years, the surface has reached the rheological transition and the deep buoyant melt rises and freezes (end of stage i). c) At 2482 years, the deep melt layer has disappeared and pockets of melt remain in the lower regions of the upper mantle. d) At 31639 years, the layer of intermediate melt fraction (35–50%) is still visible. e) At 0.26 Myr, melt fraction in the upper mantle is fully below the rheological transition (end of stage ii). f) By 29 Myr, the surface is starting to be fully solid (end of stage iii).