condition mean min max 4 h after light 8.338295 8.338295 8.338295 8 h after light 7.9809505 7.434139 8.527762 12 h after light 9.1308565 7.461503 10.80021 4 h after dark 8.885456 6.970702 10.80021 8 h after dark 9.4456445 8.446746 10.444543 12 h after dark 8.446746 8.446746 8.446746