condition mean min max 4 h after light 8.609054 7.44839 9.769718 8 h after light 7.9565865 6.928437 8.984736 12 h after light 8.6092375 7.849592 9.368883 4 h after dark 9.5546905 8.6363 10.473081 8 h after dark 8.90359 8.90359 8.90359 12 h after dark 8.288867 8.288867 8.288867