The presented results will show the richness of nuclear heavy-ion physics where data are accumulated as a succession of independent events. The different reaction mechanisms can provide for 39 A.MeV Ta+Au, 40 and 80 A.MeV Au+Au peripheral collisions a set of data almost free of entrance channel effects as well as a set of events where collision-induced correlations can be evidenced. The event selection method will be presented and it will be shown how the entrance channel dynamical effects affect determination of heat capacity through partial energy uctuation measurements.