local search (Powell, few restarts) of Phi over disc systems in the unit square; Phi - c_H - 2 nu m must stay > 0
N= 1: best Phi found = 0.18109  (c_H = 0.07447),  Phi - c_H - 2 nu m = 0.04663
N= 2: best Phi found = 0.45001  (c_H = 0.07447),  Phi - c_H - 2 nu m = 0.34554
N= 3: best Phi found = 0.34511  (c_H = 0.07447),  Phi - c_H - 2 nu m = 0.25065
N= 4: best Phi found = 0.18109  (c_H = 0.07447),  Phi - c_H - 2 nu m = 0.09163
N= 5: best Phi found = 0.26191  (c_H = 0.07447),  Phi - c_H - 2 nu m = 0.17544
N= 6: best Phi found = 0.27260  (c_H = 0.07447),  Phi - c_H - 2 nu m = 0.18813
N= 7: best Phi found = 0.26164  (c_H = 0.07447),  Phi - c_H - 2 nu m = 0.17860
N= 8: best Phi found = 0.20851  (c_H = 0.07447),  Phi - c_H - 2 nu m = 0.12654
local search OK
