A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.7778642648742995  7.676868381413635  -0.0  -0.0  # for region 1
  7.461292372857243  7.282334754795362  -0.0  -0.0  # for region 2
  2.5821544530284233  2.5457156381129695  -0.0  -0.0  # for region 3