NSGA-II, η = 20, 600 generations: 100 solutions, 100 feasible, IGD+ 0.0316, hypervolume 0.4334
NSGA-II, η = 2, 5000 generations: 100 solutions, 100 feasible, IGD+ 0.0036, hypervolume 0.4807
the whole front: hypervolume 0.4934
