condition mean min max 4 h after light 9.337099 8.556174 10.118024 8 h after light 10.1499225 10.060358 10.239487 12 h after light 9.830614 9.7708 9.890428 4 h after dark 8.5316955 7.833347 9.230044 8 h after dark 7.869126 7.742428 7.995824 12 h after dark 8.446746 8.446746 8.446746