NSGA-II, η = 20, 600 generations: 100 solutions, 100 feasible, IGD+ 0.0620, hypervolume 0.5734
NSGA-II, η = 2, 5000 generations: 100 solutions, 100 feasible, IGD+ 0.0031, hypervolume 0.6581
the whole front: hypervolume 0.6650
