Figure 3: (a) Concurrence as a function of the rescaled time, for fixed , being respectively the cut-off and thermal frequency ( with ) and the form factor, . Other data are , , . (b) Plot of the concurrence at the peak (obtained from (a)) as a function of the number of spins . (c) Plot of the collapse time, , as a function of the number of spins, . The dashed line is the best fit with .