condition mean min max 2 h after light 6.334573333333333 5.59453 7.57957 6 h after light 8.180733333333333 6.29176 9.79041 10 h after light 9.14756 7.67227 10.7752 2 h after dark 8.595343333333334 8.10651 8.91614 6 h after dark 8.24837 8.11483 8.48758 10 h after dark 4.14891 3.39197 4.53544