A 1.0 #regions in PPM
# low field   high field  bias        slope
  2.5062417379613335  2.429760182577537  -0.0  -0.0  # for region 1
  2.229731499266069  2.147366747314288  -0.0  -0.0  # for region 2
  0.3235758112391393  0.15884630733557747  -0.0  -0.0  # for region 3