condition mean min max 4 h after light 7.4454633333333335 7.364560000000001 7.51013 8 h after light 7.5406933333333335 7.510489999999999 7.591360000000001 12 h after light 7.38763 7.09813 7.661989999999999 4 h after dark 7.50258 7.40976 7.6145 8 h after dark 7.586266666666667 7.49397 7.696610000000001 12 h after dark 7.537143333333334 7.50515 7.55788