NSGA-II, η = 20, 600 generations: 100 solutions, 100 feasible, IGD+ 0.0922, hypervolume 0.5486
NSGA-II, η = 2, 5000 generations: 100 solutions, 100 feasible, IGD+ 0.0027, hypervolume 0.6833
the whole front: hypervolume 0.6883
