  Methods of extraction of the symmetry energy (or enthalpy) coefficient to
temperature ratio from isobaric and isotopic yields of fragments produced in
Fermi-energy heavy-ion collisions are discussed. We show that the methods are
consistent when the hot fragmenting source is well characterized and its
excitation energy and isotopic composition are properly taken into account. The
results are independent of the mass number of the detected fragments, which
suggests that their fate is decided very early in the reaction.
