condition mean min max 4 h after light 6.439105 6.27993 6.59828 8 h after light 2.2063699999999997 1.63651 2.77623 12 h after light 3.23315 2.93141 3.53489 4 h after dark 5.572419999999999 5.47378 5.67106 8 h after dark 6.04612 5.32212 6.77012 12 h after dark 6.516365 6.48248 6.55025