condition mean min max 4 h after light 7.41269 7.201460000000001 7.540089999999999 8 h after light 7.43072 7.30858 7.5472 12 h after light 7.511880000000001 7.40955 7.5896300000000005 4 h after dark 7.4795766666666665 7.458310000000001 7.51255 8 h after dark 7.413946666666667 7.34435 7.49067 12 h after dark 7.27544 7.21995 7.3567800000000005