  We study by numerical simulations on a lattice the behaviour of the
gauge-invariant two-point correlation functions of the gauge-field strengths
across the deconfinement phase transition, both for the pure-gauge SU(3) theory
and for full QCD with two flavours. Quenched data agree within errors with
previous determinations, but have much higher statistics. A best-fit analysis
of the data has been performed, both for the quenched and the full-QCD case,
showing that the electric gluon condensate drops to zero at the deconfining
phase transition.
