condition mean min max 4 h after light 15.6144 14.8492 16.3796 8 h after light 13.6617 13.0079 14.3155 12 h after light 12.43855 11.6743 13.2028 4 h after dark 12.4775 11.8189 13.1361 8 h after dark 14.3766 13.9565 14.7967 12 h after dark 15.7777 14.5495 17.0059