condition mean min max 4 h after light 7.933171 7.924602 7.94174 8 h after light 8.008772 7.632523 8.385021 12 h after light 9.210239 8.387326 10.033152 4 h after dark 8.8720945 8.842704 8.901485 8 h after dark 8.0714145 7.755503 8.387326 12 h after dark 9.801352 9.801352 9.801352