condition mean min max 4 h after light 6.564906666666667 6.4759400000000005 6.716810000000001 8 h after light 6.803403333333334 6.645389999999999 7.002510000000001 12 h after light 6.924363333333333 6.77377 7.11228 4 h after dark 6.52887 6.4360800000000005 6.58327 8 h after dark 6.452233333333333 6.2964 6.64705 12 h after dark 6.548430000000001 6.387230000000001 6.82282