Figure 24.
The plot marks S equals 3, 3.7, 4.9, 5.7, 8.6. The horizontal axis is xi and ranges from 0.5 to 2.0. The vertical axis is R e raised to minus 1 over 2 N u and ranges from minus 6 to above 4. The curves begin near 0.5 at xi 0.5 and increase gradually to xi about 1.0. The curves then oscillate with increasing amplitude toward xi 2.0. Peaks rise above 4 near the right side. Troughs drop below minus 2 and then below minus 4 near the right side. An arrow points from the S values toward the rising curve group near xi about 1.0.Variations of S on