condition mean min max 4 h after light 1.38939 1.34743 1.43135 8 h after light 1.79794 1.75228 1.8436 12 h after light 1.9929 1.73419 2.25161 4 h after dark 3.753115 3.28451 4.22172 8 h after dark 2.36702 2.24288 2.49116 12 h after dark 2.730415 2.61065 2.85018