condition mean min max 4 h after light 8.852325 8.56632 9.13833 8 h after light 9.73288 9.45016 10.0156 12 h after light 8.991215 8.07662 9.90581 4 h after dark 12.3352 11.6037 13.0667 8 h after dark 10.7324 10.14 11.3248 12 h after dark 11.12955 10.7769 11.4822