NSGA-II, η = 20, 1000 generations: 300 solutions, 300 feasible, IGD+ 0.0155, hypervolume 0.4201
NSGA-II, η = 5, 1000 generations: 300 solutions, 300 feasible, IGD+ 0.0005, hypervolume 0.4459
the whole front: hypervolume 0.4476
