A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.79821177789291  7.631583321100327  -0.0  -0.0  # for region 1
  7.487171991880087  7.276109279942815  -0.0  -0.0  # for region 2
  2.5994039259643036  2.5105354156749256  -0.0  -0.0  # for region 3