  We extract values for the free symmetry energy as a function of the fragment
size (the proton number Z) from antisymmetrized molecular dynamics (AMD)
calculations of calcium collisions. Simple statistical physics describe well
the distribution of hot nuclei at breakup, provided the surface symmetry term
in the free energy is much smaller at high excitation than in ground state
nuclei. This result may reflect the condition of low density and finite
temperature when these systems disassemble.
