A 1.0 #regions in PPM
# low field   high field  bias        slope
  1.4998869205512357  1.4599938719153576  0.0  0.0  # for region 1
  1.3499440825750022  1.310051033939124  0.0  0.0  # for region 2
  0.05043948678099536  -0.05043948678099536  0.0  0.0  # for region 3
