condition mean min max 4 h after light 1.78411 1.20452 2.3637 8 h after light 1.761045 1.76002 1.76207 12 h after light 3.5694 3.11753 4.02127 4 h after dark 7.809046666666666 7.03782 8.41845 8 h after dark 6.575753333333333 5.51581 7.45071 12 h after dark 5.204470000000001 4.80144 5.60111