A 1.0 #regions in PPM
# low field   high field  bias        slope
  13.044227  12.155458  0.0  0.0  # for region 1
  3.4038339860025477  3.2985012683348134  0.0  0.0  # for region 2
  3.2768575592250047  3.1931685506670786  0.0  0.0  # for region 3
  2.9074715904176065  2.717006950251292  0.0  0.0  # for region 4