condition mean min max 0 h after light 2.96529 2.83001 3.10057 4 h after light 2.158995 1.97006 2.34793 8 h after light 4.514965 4.30767 4.72226 4 h after dark 5.604325 4.71231 6.49634 8 h after dark 4.283525 3.9526 4.61445 12 h after dark 2.909155 2.69241 3.1259