Porosity after the cooling of the body below 300 K as a function of depth. Left panel: , models B_creep (solid lines) and B_par (dashed lines). Right panel: , models S_creep (solid lines) and S_par (dashed lines). For each model four different packings are considered. From top to bottom (at the depth of zero km) the lines (both solid and dashed) correspond to SCP, ORP, BCCP, and RHP. We note that for the single packings the different porosities in the primordial layer result in a variation of the radius (see Table 3). In addition, for a chosen packing with different final average porosities (i.e. different thickness of the porous layer), the associated solid and dashed lines have different lengths. This is not obvious here because the dashed lines are overlaid by the solid lines at depth.