NSGA-II, η = 20, 1000 generations: 300 solutions, 300 feasible, IGD+ 0.0006, hypervolume 0.8482
NSGA-II, η = 5, 1000 generations: 300 solutions, 300 feasible, IGD+ 0.0007, hypervolume 0.8478
the whole front: hypervolume 0.8494
