Redshifted temperature as function of mass density at selected time moments (marked near the curves) during the outburst for the same three models of the crust as in Fig. 2. The labels at the left mark the time since the start of the outburst. The redshifted temperature in the core is K. The long vertical dotted lines mark the boundaries of the crust with the envelope and the core. The short vertical dotted lines mark the positions of the heat sources in the HZ’08 model.