condition mean min max 4 h after light 8.854583333333334 8.53987 9.038680000000001 8 h after light 7.471806666666667 6.9584600000000005 7.830539999999999 12 h after light 6.993213333333333 6.599069999999999 7.19384 4 h after dark 6.0106 5.881130000000001 6.268269999999999 8 h after dark 6.625436666666667 6.324330000000001 6.89376 12 h after dark 7.28711 7.04303 7.56595