27 FIG. 7: Degree distribution P ( k ) for the NHCD at different growth stages, from t = 30 days to t = 240 days. 1 10 k 10 -4 10 -3 10 -2 10 -1 10 0 P(k) t=30 t=35 t=40 t=50 t=90 t=125 t=140 t=240 Final 3.0