  Measurements of the density dependence of the free symmetry energy in low
density clustered matter have been extended using the NIMROD multi-detector at
Texas A&M University. Thermal coalescence models were employed to extract
densities, $\rho$, and temperatures, $T$, for evolving systems formed in
collisions of 47 $A$ MeV $^{40}$Ar + $^{112}$Sn,$^{124}$Sn and $^{64}$Zn +
$^{112}$Sn, $^{124}$Sn. Densities of $0.03 \leq \rho/\rho_0 \leq 0.2$ and
temperatures in the range 5 to 10 MeV have been sampled. The free symmetry
energy coefficients are found to be in good agreement with values calculated
using a quantum statistical model. Values of the corresponding symmetry energy
coefficient are derived from the data using entropies derived from the model.
