Percent Integrated Gradient Field Ratio for hardat.ru4 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)                         %                 
  ---------     ----------------------------------  
  46.89650                    0.38808
  70.93746                    0.39300
  95.01700                    0.39309
 119.92229                    0.36634
 150.00842                    0.37338
 175.09634                    0.35951