The horizontal axis gives xi from 0 to 4, and the vertical axis gives Reynolds number to power negative one half times N u from negative 60 to 5. The legend lists M 0, M 1, and M 2. Several curves stay close to values between about negative 3 and 3 across xi. The Q 0.05 curves decrease below 0 as xi increases, with the lowest dotted curve reaching about negative 60 near xi 2.6.