condition mean min max 4 h after light 8.611137 8.367154 8.85512 8 h after light 9.222242 8.748443 9.696041 12 h after light 8.0759855 7.203708 8.948263 4 h after dark 9.707598 8.818262 10.596934 8 h after dark 9.3519095 9.237708 9.466111 12 h after dark 9.827839 9.827839 9.827839