A 1.0 #regions in PPM
# low field   high field  bias        slope
  3.872531829880626  3.807221273225893  -0.0  -0.0  # for region 1
  3.3077876046897012  3.2424770480349685  -0.0  -0.0  # for region 2
  1.0718614886276732  1.021918121774054  -0.0  -0.0  # for region 3
  0.7491505028042877  0.4879082761853566  -0.0  -0.0  # for region 4
