A 1.0 #regions in PPM
# low field   high field  bias        slope
  3.928360189685422  3.8215219418487893  0.0  0.0  # for region 1
  3.394168950502258  3.2380207421256406  0.0  0.0  # for region 2
  2.744921136725797  2.5805546015925156  0.0  0.0  # for region 3