Radius vs. mass curves for different core entropy and irradiation. Each group of lines with a different color and line style denotes a different entropy. Solid black, dotted red, short‐dashed green, long‐dashed blue, and dot‐dashed cyan lines represent entropies ﹩Sm_{p}/ k_{\mathrm{B}\,}=6,\ldots ,10﹩. Each group of lines represents deep isotherms ﹩T_{\mathrm{deep}\,}=500﹩, 1500, 2500, and 3500 K, from bottom to top.