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Neutron-proton elliptic flow difference and ratio have been shown to bepromising observables in the attempt to constrain the density dependence of thesymmetry energy above the saturation point from heavy-ion collision data. Theirdependence on model parameters like microscopic nucleon-nucleon cross-sections,compressibility of nuclear matter, optical potential, and symmetry energyparametrization is thoroughly studied. By using a parametrization of thesymmetry energy derived from the momentum dependent Gogny force in conjunctionwith the T\"{u}bingen QMD model and comparing with the experimental FOPI/LANDdata for 197Au+197Au collisions at 400 MeV/nucleon, a moderately stiff, x=-1.35+/- 1.25, symmetry energy is extracted, a result that agrees with that of asimilar study that employed the UrQMD transport model and a momentumindependent power-law parametrization of the symmetry energy. This contrastswith diverging results extracted from the FOPI $\pi^{-}/\pi^{+}$ ratioavailable in the literature.

Towards a model-independent constraint of the high-density dependence of the symmetry energy