A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.301717920933715  7.198876823455776  -0.0  -0.0  # for region 1
  2.960822788092947  2.801003024492298  -0.0  -0.0  # for region 2
  2.801003024492298  2.6504213975159643  -0.0  -0.0  # for region 3
  2.5016873978644933  2.3012198331168583  -0.0  -0.0  # for region 4
