A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.797029702970297  7.642326732673268  -0.0  -0.0  # for region 1
  7.506188118811881  7.28960396039604  -0.0  -0.0  # for region 2
  2.6423267326732676  2.5123762376237626  -0.0  -0.0  # for region 3