condition mean min max 4 h after light 8.687199 8.493151 8.881247 8 h after light 9.187430500000001 8.176201 10.19866 12 h after light 8.427844499999999 8.362538 8.493151 4 h after dark 8.6256545 8.341649 8.90966 8 h after dark 8.8495245 7.570837 10.128212 12 h after dark 9.273785 9.273785 9.273785