A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.883432289600813  7.517436538499227  -0.0  -0.0  # for region 1
  2.5445418886110214  2.4864473249441033  -0.0  -0.0  # for region 2
  2.2598785266431216  2.184355593876128  -0.0  -0.0  # for region 3