NSGA-II, η = 20, 600 generations: 100 solutions, 100 feasible, IGD+ 0.0253, hypervolume 0.6595
NSGA-II, η = 2, 5000 generations: 100 solutions, 100 feasible, IGD+ 0.0035, hypervolume 0.7030
the whole front: hypervolume 0.7100
