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)                         %                 
  ---------     ----------------------------------  
  46.89656                    0.38277
  95.02115                    0.37747
 119.92204                    0.37505
 150.00643                    0.37856
 175.09821                    0.38861