condition mean min max 4 h after light 6.6322849999999995 5.65521 7.60936 8 h after light 5.43011 5.29681 5.56341 12 h after light 5.21936 5.04473 5.39399 4 h after dark 6.645366666666667 5.91027 7.06526 8 h after dark 6.72868 6.12105 7.16778 12 h after dark 7.002423333333334 6.43939 7.36687