Percent Integrated Gradient Field Ratio for hardat.ru4 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)                         %                 
  ---------     ----------------------------------  
  46.88922                    1.62418
  70.93892                    1.61687
  94.97047                    1.62713
 119.91194                    1.64580
 149.96423                    1.66677
 175.04047                    1.68897