A 1.0 #regions in PPM
# low field   high field  bias        slope
  3.7946024820551614  3.72138659916787  -0.0  -0.0  # for region 1
  3.7075008282754522  3.644383687855373  -0.0  -0.0  # for region 2
  3.644383687855373  3.568643119351278  -0.0  -0.0  # for region 3
