condition mean min max 4 h after light 0.0 0.0 0.0 8 h after light 0.0 0.0 0.0 12 h after light 0.0123607 0.0 0.0247214 4 h after dark 0.0081449 0.0 0.0162898 8 h after dark 0.0081633 0.0 0.0163266 12 h after dark 0.0 0.0 0.0