condition mean min max 4 h after light 6.460123333333334 6.0285 6.699389999999999 8 h after light 6.25244 5.66488 6.59282 12 h after light 6.57746 6.109 6.81257 4 h after dark 6.581356666666667 6.17839 6.88512 8 h after dark 6.565296666666667 6.14821 6.94473 12 h after dark 6.6479099999999995 6.132219999999999 6.90591