condition mean min max 0 h after light 0.0 0.0 0.0 4 h after light 0.923835 0.0 1.84767 8 h after light 0.0 0.0 0.0 4 h after dark 0.0 0.0 0.0 8 h after dark 0.0 0.0 0.0 12 h after dark 0.0 0.0 0.0