A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.248395420956074  7.1814237503999765  -0.0  -0.0  # for region 1
  6.671408720780466  6.568375381463393  -0.0  -0.0  # for region 2
  2.143093457795115  2.0967284551024323  -0.0  -0.0  # for region 3