Table 2. Self-Similar Parameters D, Ak, and ck Parameter Value D 2.002 A1 0.463 A2 -0.522 A3 0.407 A4 -.0212 c1 \frac{2}{\pi} c2 \frac{1}{2} c3 \frac{4}{3\pi} c4 \frac{3}{8}