A 1.0 #regions in PPM
# low field   high field  bias        slope
  5.028423863842913  3.7931331857947357  -300534.0  -5.151149851632048  # for region 1
  4.956214093026674  3.784024883816501  -40365.0  -12.826460816884893  # for region 2
  4.923194678682725  4.734984016922218  -37298.0  13.143377885783718  # for region 3
  4.900259047356679  4.738007843507083  -289699.0  13.767277856135403  # for region 4
