NSGA-II  after 250 generations: 100 solutions, IGD+ 0.0038, hypervolume 0.8694
NSGA-II  after 500 generations: 100 solutions, IGD+ 0.0032, hypervolume 0.8703
SMS-EMOA after 250 generations: 100 solutions, IGD+ 0.0294, hypervolume 0.8267
SMS-EMOA after 500 generations: 100 solutions, IGD+ 0.0028, hypervolume 0.8711
the whole front: hypervolume 0.8767
