Table 2. Modeling polynomials of absolute Cd values of the back swimmer for each velocity simulation, and for average velocity (residuals are shown). Velocity (m·s-1) Polynomial Norm of residuals 1.60 Cd = 0.0057737*x4+0.0061124*x3+0.007867*x2+0.076781*x+0.58322 .031076 1.70 Cd = 0.004*x4-0.049*x3+0.20*x2-0.25*x+0.57 .028054 1.80 Cd = 0.00077*x4 - 0.0094*x3 + 0.042*x2 - 0.039*x + 0.49 .029074 1.90 Cd = 0.00052*x4 - 0.0063*x3 + 0.029*x2 - 0.018*x + 0.47 .031232 2.00 Cd = 9.5e-005*x4 - 0.0014*x3 + 0.011*x2 - 3.5e-005*x + 0.46 .033634 Average Cd = 0.00042*x4- 0.005*x3 + 0.024*x2 - 0.012*x + 0.48 .010569