Radius vs. time for planets with masses of 0.3, 1, and 3 M_J (top, middle, and bottom panels, respectively). Left (right) panels correspond to models assuming a core+envelope (fully mixed) structure. Results with different H–He EOSs are shown with dashed and solid lines. The colours correspond to different assumed metallicities. The middle and bottom panels have similar limits on the y-axis, but not the top panels.