NSGA-II, η = 20, 600 generations: 100 solutions, 100 feasible, IGD+ 0.0561, hypervolume 0.4809
NSGA-II, η = 2, 5000 generations: 100 solutions, 100 feasible, IGD+ 0.0022, hypervolume 0.5786
the whole front: hypervolume 0.5819
