condition mean min max 4 h after light 2.70397 2.11185 3.29609 8 h after light 4.249085 4.21013 4.28804 12 h after light 6.21325 5.66119 6.76531 4 h after dark 6.92399 6.8743 6.97368 8 h after dark 4.302475 4.10613 4.49882 12 h after dark 4.273045 3.96516 4.58093