A 1.0 #regions in PPM
# low field   high field  bias        slope
  8.148888548285838  7.843711048867961  -0.0  -0.0  # for region 1
  3.0322955793222994  2.902432813612565  -0.0  -0.0  # for region 2
  2.902432813612565  2.785556324473804  -0.0  -0.0  # for region 3