Maximum value of the temperature at radius r achieved during the whole thermal evolution of the body for models calculated with a porosity dependence of the heat conductivity for granular material (model G) as calculated in this work (long dashed) and for the dependence as derived from meteoritic data (model Y) of Yomogida & Matsui (1983; short dashed). The solid part of the lines correspond to that part of the body where the material is compacted by sintering. Also shown are the limits between the range of metamorphic temperatures for different petrologic classes and the solidus temperatures of metal and silicates.