From the measurements of nine dilatometric samples, a total length change Δl/ltotal=(7.02±1.92)×10-4 is deduced that comprises a fraction (Δl/l0)Stage A=(1.32±0.46)×10-4 for stage A, (Δl/l0)Stage B=(1.85±0.37)×10-4 for stage B and (Δl/l0)Stage C=(3.77±1.33)×10-4 for stage C.