condition mean min max 0 h after light 4.20786 3.88045 4.53527 4 h after light 5.96227 3.95389 7.97065 8 h after light 5.52196 5.11882 5.9251 4 h after dark 7.31841 7.01462 7.6222 8 h after dark 8.15077 7.06561 9.23593 12 h after dark 6.072485 5.68624 6.45873