The horizontal axis gives xi from 0 to 4, and the vertical axis gives Reynolds number to power one half times C f from 0 to 100. The legend lists M 0, M 1, and M 2. The curves for Q negative 0.05 oscillate between about 5 and 20. The curves for Q 0 oscillate mostly between about 10 and 50. The curves for Q 0.05 rise highest, reaching about 100 as xi increases to 4.