A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.301717920933715  7.2010193463198995  -0.0  -0.0  # for region 1
  2.9602726053217046  2.8001342109070837  -0.0  -0.0  # for region 2
  2.8001342109070837  2.6500616584270964  -0.0  -0.0  # for region 3
  2.499989105947109  2.299587343793955  -0.0  -0.0  # for region 4
