condition mean min max 4 h after light 8.7444085 7.931392 9.557425 8 h after light 7.9466535 7.791728 8.101579 12 h after light 8.0039985 7.804456 8.203541 4 h after dark 7.9568605 6.670902 9.242819 8 h after dark 8.766295 8.101579 9.431011 12 h after dark 8.426391 8.426391 8.426391