Mass fractions of a dense core model evaluated with different temperature profiles. The yellow curves mark the mass fraction of the protosolar H–He mixture. The blue, brown, and gray curves mark the heavy-element mass fraction of water, rock, and iron, respectively. The solid lines mark the mass fractions as evaluated by our method. Mass fractions obtained with the adiabatic temperature profiles P19+N13 cold and Nettelmann+13 orig. are shown with dashed and dotted curves, respectively. Finally, the mass fractions based on the non-adiabatic temperature of Vazan4 are presented with dash-dotted curves. The gray and blue shaded area indicates the convective and non-convective regions, respectively, as identified by our algorithm.