  The characterization of hot quasi-projectiles produced in symmetric or
quasi-symmetric reactions (Au + Au, Xe + Sn, Ni + Ni, Ar + KCl) at di erent
incident energies are estimated by means of two di erent procedures. The
advantages and disadvantages of each method are analyzed on the basis of
simulations using events produced by two slightly di erent models: HIPSE and
ELIE.
