Elliptic Integral Second Kind RD

      x        y        z           actual            rd(x,y,z)
    0.10     0.10     0.10       3.162278e+01       3.162277e+01
    0.00     2.00     1.00       1.797210e+00       1.797210e+00
  100.00   100.00   100.00       1.000000e-03       1.000000e-03