A 1.0 #regions in PPM
# low field   high field  bias        slope
  3.8120325445148278  3.7167317309019574  -0.0  -0.0  # for region 1
  3.502304900272998  3.401047785809323  -0.0  -0.0  # for region 2
  1.9000599714066095  1.7749776535397168  -0.0  -0.0  # for region 3