Percent Integrated Gradient Field Ratio for hardat.ru5 at radius 0.0175 m. 
  where Integrated Gradient Field Ratio = Sum[(abs(Bn/B2*sin(-n*theta_south_pole ))] for harmonics 3-16  

    Imag        Integrated Gradient Field Ratio 
    (A)                         %                 
  ---------     ----------------------------------  
  46.89730                    1.62481
  70.95022                    1.61605
  94.98430                    1.62668
 119.93129                    1.64210
 149.99237                    1.66276
 175.07444                    1.68526