Inferred composition and temperature for our Uranus empirical models for U_3,comp (top) and U_4,comp (bottom). The x-axis corresponds to the mass fraction of a material and the y-axis shows the central temperature. The colours represent different materials (see legend of Figure 6) and the error bars indicate the 1σ range of solutions found by the random algorithm for each density profile. To improve readability, error bars for the central temperature T_c are not shown. They are included in Figure 11.