Percent Integrated Gradient Field Ratio for hardat.ru5 at radius 0.02697 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)                         %                 
  ---------     ----------------------------------  
  46.89710                    0.32658
  95.02370                    0.32224
 119.92248                    0.32035
 150.00917                    0.31878
 175.09869                    0.32565