condition mean min max 0 h after light 0.0 0.0 0.0 4 h after light 0.0 0.0 0.0 8 h after light 0.0 0.0 0.0 4 h after dark 0.161686 0.161367 0.162005 8 h after dark 0.0 0.0 0.0 12 h after dark 0.0 0.0 0.0