NSGA-II, η = 20, 600 generations: 100 solutions, 100 feasible, IGD+ 0.2932, hypervolume 0.1635
NSGA-II, η = 2, 5000 generations: 100 solutions, 100 feasible, IGD+ 0.0017, hypervolume 0.4026
the whole front: hypervolume 0.4043
