Main contributions to the white dwarf luminosity (solid dark-green line) in terms of the cooling age (defined as zero when the star reaches the maximum effective temperature) for the 1.16 M_⊙ ONe model including crystallization and exsolution processes. The dashed red line displays the gravothermal energy release, the dashed green line indicates the energy lost by neutrino emission, the dotted blue line is the latent heat of crystallization, the dot-dashed orange line shows the energy released due to the ONe phase separation induced by crystallization, and the dot-dashed yellow line displays the exsolution heat. The arrows indicate the times when these physical processes are acting. The crosses indicate the moments at which we plot the chemical profiles in Fig. 3.