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 0.142452 0.0 0.284904 4 h after dark 0.274881 0.0 0.549762 8 h after dark 0.0 0.0 0.0 12 h after dark 0.0 0.0 0.0