A 1.0 #regions in PPM
# low field   high field  bias        slope
  9.50697296026492  9.394565182519042  -0.0  -0.0  # for region 1
  7.959779595394237  7.940468264218821  -0.0  -0.0  # for region 2
  6.0189255538474065  5.923549257578178  -0.0  -0.0  # for region 3
