Internal temperature profile of the cooling WD model at various times. We show the initial profile (dotted red), the profile shortly after the formation of the fully crystallized core (long-dashed blue), three profiles at 45.6 Myr since the beginning of the modeling (dot-dashed green for the default latent heat value, dot-dashed brown for twice lower and zero latent heat values), and profiles at other times (solid green; see the main text for details). The crystallization temperature is shown with thick short orange dashes.