condition mean min max 4 h after light 7.01731 6.40949 8.06287 8 h after light 7.731843333333333 6.95592 8.27074 12 h after light 7.9236466666666665 7.322489999999999 8.40977 4 h after dark 8.146883333333335 7.877860000000001 8.298210000000001 8 h after dark 8.41488 8.11765 8.56413 12 h after dark 8.634269999999999 8.31942 8.85159