  We study the correlation between balance energy and transition energy of
fragment in heavy-ion collisions for different systems at incident energies
between 40 and 1200 MeV/nucleon using an isospin-dependent quantum molecular
dynamics model. With increasing incident energy, the elliptic flow shows a
transition from positive (in-plane) to negative (out-of-plane) flow. This
transition energy is found to depend on the size of fragments, composite mass
of reacting system, and the impact parameter of reaction. It has been observed
that reduced cross-section can explain the experimental data. There is a
correlation between transition energy and balance energy as their difference
decreases with increase in the total mass of colliding nuclei.
