condition mean min max 4 h after light 4.10783 3.55111 4.66455 8 h after light 3.472625 3.19278 3.75247 12 h after light 2.719435 2.37506 3.06381 4 h after dark 3.957835 3.91618 3.99949 8 h after dark 4.337895 4.31871 4.35708 12 h after dark 4.38846 4.24718 4.52974