Volume fractions (horizontal axis) of solid iron (black), liquid iron (red), solid silicates (green) and liquid silicates (yellow) as functions of the relative radius r/R_p(t) (vertical axis). Plotted data show the internal structures at the time when the core formation is completed, i.e. no more iron separation from a matrix with silicates (case G2 and G3) and for the model without core formation at the time 30 Ma (case G1). Left panel corresponds to the case G1, middle panel to G2 and right panel to G3.