Percent Integrated Gradient Field Ratio for hardat.ru2 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)                         %                 
  ---------     ----------------------------------  
  46.89646                    0.63216
  70.95107                    0.64347
  94.98546                    0.64528
 119.93158                    0.64284
 149.99069                    0.64354
 175.07076                    0.64280